Use Azure mirrors of Ubuntu .deb repositories in containers.

This reduces the likelihood of spurious CI failures caused by DDoS filters
being triggered by massive numbers of concurrent CI jobs.

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-# Copyright 2021-2024 Andrey Semashev
+# Copyright 2021-2025 Andrey Semashev
 #
 # Distributed under the Boost Software License, Version 1.0.
 # (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
@@ -85,32 +85,50 @@ jobs:
               - g++-8
           - toolset: gcc-9
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - g++-9
           - toolset: gcc-10
             cxxstd: "11,14,17,20"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - g++-10
           - toolset: gcc-11
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
             os: ubuntu-22.04
             install:
               - g++-11
           - toolset: gcc-12
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
             os: ubuntu-22.04
             install:
               - g++-12
+          - toolset: gcc-13
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            os: ubuntu-24.04
+            install:
+              - g++-13
+          - toolset: gcc-14
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-24.04
+            install:
+              - g++-14
+          - toolset: gcc-15
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-latest
+            container: ubuntu:25.04
+            install:
+              - g++-15
           - name: UBSAN
-            toolset: gcc-11
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            toolset: gcc-13
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
             ubsan: 1
             build_variant: debug
-            os: ubuntu-22.04
+            os: ubuntu-24.04
             install:
-              - g++-11
+              - g++-13
 
           # Linux, clang
           - toolset: clang
@@ -189,13 +207,15 @@ jobs:
           - toolset: clang
             compiler: clang++-9
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - clang-9
           - toolset: clang
             compiler: clang++-10
             cxxstd: "11,14,17,20"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - clang-10
           - toolset: clang
@@ -206,7 +226,7 @@ jobs:
               - clang-11
           - toolset: clang
             compiler: clang++-12
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
             os: ubuntu-22.04
             install:
               - clang-12
@@ -214,7 +234,7 @@ jobs:
             gcc_toolchain: 11
           - toolset: clang
             compiler: clang++-13
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
             os: ubuntu-22.04
             install:
               - clang-13
@@ -222,7 +242,7 @@ jobs:
             gcc_toolchain: 11
           - toolset: clang
             compiler: clang++-14
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
             os: ubuntu-22.04
             install:
               - clang-14
@@ -230,73 +250,73 @@ jobs:
             gcc_toolchain: 11
           - toolset: clang
             compiler: clang++-15
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
             os: ubuntu-22.04
             install:
               - clang-15
               - g++-11
             gcc_toolchain: 11
-          - toolset: clang
-            compiler: clang++-15
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
-            os: ubuntu-22.04
-            install:
-              - clang-15
-              - libc++-15-dev
-              - libc++abi-15-dev
-            cxxflags: -stdlib=libc++
-            linkflags: -stdlib=libc++
           - toolset: clang
             compiler: clang++-16
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
-            os: ubuntu-22.04
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            os: ubuntu-24.04
             install:
               - clang-16
-            sources:
-              - "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main"
-            source_keys:
-              - "https://apt.llvm.org/llvm-snapshot.gpg.key"
+              - g++-11
+            gcc_toolchain: 11
           - toolset: clang
             compiler: clang++-17
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
-            os: ubuntu-22.04
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            os: ubuntu-24.04
             install:
               - clang-17
-            sources:
-              - "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-17 main"
-            source_keys:
-              - "https://apt.llvm.org/llvm-snapshot.gpg.key"
+              - g++-11
+            gcc_toolchain: 11
           - toolset: clang
-            compiler: clang++-17
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
-            os: ubuntu-22.04
+            compiler: clang++-18
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-24.04
             install:
-              - clang-17
-              - libc++-17-dev
-              - libc++abi-17-dev
-            sources:
-              - "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-17 main"
-            source_keys:
-              - "https://apt.llvm.org/llvm-snapshot.gpg.key"
+              - clang-18
+              - g++-13
+          - toolset: clang
+            compiler: clang++-19
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-24.04
+            install:
+              - clang-19
+          - toolset: clang
+            compiler: clang++-20
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-latest
+            container: ubuntu:25.04
+            install:
+              - clang-20
+          - toolset: clang
+            compiler: clang++-20
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
             cxxflags: -stdlib=libc++
             linkflags: -stdlib=libc++
+            os: ubuntu-latest
+            container: ubuntu:25.04
+            install:
+              - clang-20
+              - libc++-20-dev
+              - libc++abi-20-dev
           - name: UBSAN
             toolset: clang
-            compiler: clang++-15
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            compiler: clang++-18
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
             cxxflags: -stdlib=libc++
             linkflags: -stdlib=libc++
             ubsan: 1
             build_variant: debug
-            os: ubuntu-22.04
+            os: ubuntu-24.04
             install:
-              - clang-15
-              - libc++-15-dev
-              - libc++abi-15-dev
+              - clang-18
+              - libc++-18-dev
+              - libc++abi-18-dev
 
-          - toolset: clang
-            cxxstd: "11,14,17,20,2b"
-            os: macos-12
           - toolset: clang
             cxxstd: "11,14,17,20,2b"
             os: macos-13
@@ -321,6 +341,22 @@ jobs:
                 echo "GHA_CONTAINER=${{matrix.container}}" >> $GITHUB_ENV
                 if [ -f "/etc/debian_version" ]
                 then
+                    # Use Azure APT mirrors in containers to avoid HTTP errors due to DDoS filters triggered by lots of CI jobs launching concurrently.
+                    # Note that not all Ubuntu versions support "mirror+file:..." URIs in APT sources, so just use Azure mirrors exclusively.
+                    # Note also that on recent Ubuntu versions DEB822 format is used for source files.
+                    APT_SOURCES=()
+                    if [ -d "/etc/apt/sources.list.d" ]
+                    then
+                        readarray -t APT_SOURCES < <(find "/etc/apt/sources.list.d" -type f -name '*.sources' -print)
+                    fi
+                    if [ -f "/etc/apt/sources.list" ]
+                    then
+                        APT_SOURCES+=("/etc/apt/sources.list")
+                    fi
+                    if [ "${#APT_SOURCES[@]}" -gt 0 ]
+                    then
+                        sed -i -E -e 's!([^ ]+) (http|https)://(archive|security)\.ubuntu\.com/ubuntu[^ ]*(.*)!\1 http://azure.archive.ubuntu.com/ubuntu/\4!' "${APT_SOURCES[@]}"
+                    fi
                     apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
                     if [ "$(apt-cache search "^python-is-python3$" | wc -l)" -ne 0 ]
                     then
@@ -520,14 +556,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - toolset: msvc-14.0
-            cxxstd: "14"
-            addrmd: 32,64
-            os: windows-2019
-          - toolset: msvc-14.2
-            cxxstd: "14,17,20,latest"
-            addrmd: 32,64
-            os: windows-2019
           - toolset: msvc-14.3
             cxxstd: "14,17,20,latest"
             addrmd: 32,64
@@ -537,9 +565,9 @@ jobs:
             addrmd: 32,64
             os: windows-2022
           - toolset: gcc
-            cxxstd: "11,14,17,2a"
+            cxxstd: "11,14,17,20,23"
             addrmd: 64
-            os: windows-2019
+            os: windows-2022
 
     timeout-minutes: 15
     runs-on: ${{matrix.os}}