Added ARM jobs in GitHub Actions.

.github/workflows/ci.yml

@@ -356,6 +356,14 @@ jobs:
               - libc++-15-dev
               - libc++abi-15-dev
 
+          - name: ARM
+            toolset: gcc-13
+            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            os: ubuntu-24.04-arm
+            container: ubuntu:24.04
+            install:
+              - g++-13
+
           - toolset: clang
             cxxstd: "03,11,14,17,20,2b"
             os: macos-13
@@ -612,6 +620,13 @@ jobs:
             addrmd: 64
             os: windows-2022
 
+          # Windows SDK 32-bit ARM libs not installed in this image
+          - name: ARM
+            toolset: msvc-14.3
+            cxxstd: "14,17,20,latest"
+            addrmd: 64
+            os: windows-11-arm
+
     runs-on: ${{matrix.os}}
     timeout-minutes: 45