build: gitpod environment updated

.gitpod/Dockerfile

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+FROM trainiteu/gitpod-cpp
+
+# Add clang apt repositories
+RUN lsb_rel=`lsb_release -cs` && \
+    sudo add-apt-repository "deb http://apt.llvm.org/${lsb_rel}/ llvm-toolchain-${lsb_rel}-16 main"
+
+# Install older compilers supported by the project
+RUN sudo install-packages \
+  g++-12 \
+  clang-16

.gitpod/conan/global.conf

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+tools.cmake.cmaketoolchain:generator=Ninja Multi-Config
+tools.cmake.cmake_layout:build_folder_vars=["settings.compiler", "settings.compiler.version", "settings.compiler.cppstd"]

.gitpod/conan/profiles/clang16

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+[settings]
+arch=x86_64
+build_type=Release
+compiler=clang
+compiler.cppstd=20
+compiler.libcxx=libc++
+compiler.version=16
+os=Linux
+
+[conf]
+tools.build:compiler_executables={"c": "clang-16", "cpp": "clang++-16"}

.gitpod/conan/profiles/clang17

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+[settings]
+arch=x86_64
+build_type=Release
+compiler=clang
+compiler.cppstd=20
+compiler.libcxx=libc++
+compiler.version=17
+os=Linux
+
+[conf]
+tools.build:compiler_executables={"c": "clang-17", "cpp": "clang++-17"}

.gitpod/conan/profiles/gcc12

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+[settings]
+arch=x86_64
+build_type=Release
+compiler=gcc
+compiler.cppstd=20
+compiler.libcxx=libstdc++11
+compiler.version=12
+os=Linux
+
+[conf]
+tools.build:compiler_executables={"c": "gcc-12", "cpp": "g++-12"}

.gitpod/conan/profiles/gcc13

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+[settings]
+arch=x86_64
+build_type=Release
+compiler=gcc
+compiler.cppstd=20
+compiler.libcxx=libstdc++11
+compiler.version=13
+os=Linux
+
+[conf]
+tools.build:compiler_executables={"c": "gcc-13", "cpp": "g++-13"}