Simplify GCC pipeline and bump Clang to 23

.github/workflows/bvt-clang.yml

@@ -3,7 +3,7 @@ on:
   workflow_dispatch:
 
 env:
-  CLANG_VERSION: 22
+  CLANG_VERSION: 23
 
 jobs:
   bvt-clang:

.github/workflows/bvt-codecoverage.yml

@@ -2,22 +2,28 @@ on:
   workflow_call:
   workflow_dispatch:
 
+env:
+  GCC_VERSION: 16
+
 jobs:
   bvt-codecoverage:
     runs-on: ubuntu-26.04
-    container: gcc:16
     steps:
     - uses: actions/checkout@v7
 
-    - name: Install CMake, Ninja, and gcovr
+    - name: Install gcc and gcovr
       run: |
-        apt-get update
-        apt-get install -y cmake ninja-build gcovr
+        sudo apt install -y "g++-$GCC_VERSION" gcovr
+        {
+          echo "CC=gcc-$GCC_VERSION"
+          echo "CXX=g++-$GCC_VERSION"
+          echo "GCOV=gcov-$GCC_VERSION"
+        } >> "$GITHUB_ENV"
 
     - name: Check toolchain versions
       run: |
-        g++ --version
-        gcov --version
+        "$CXX" --version
+        "$GCOV" --version
         cmake --version
         ninja --version
         gcovr --version
@@ -39,7 +45,7 @@ jobs:
         mkdir -p build/coverage/report
         gcovr --root . \
           --filter 'include/proxy/' \
-          --gcov-executable gcov \
+          --gcov-executable "$GCOV" \
           --exclude-unreachable-branches \
           --print-summary \
           --txt build/coverage/report/coverage.txt \

.github/workflows/bvt-compatibility.yml

@@ -12,12 +12,14 @@ jobs:
         compiler:
           - {family: gcc, version: 13, modules: false, doc_tests: true, runner: ubuntu-26.04}
           - {family: gcc, version: 14, modules: false, doc_tests: true, runner: ubuntu-26.04}
+          - {family: gcc, version: 15, modules: true, doc_tests: true, runner: ubuntu-26.04}
           - {family: clang, version: 16, modules: false, doc_tests: false, runner: ubuntu-24.04}
           - {family: clang, version: 17, modules: false, doc_tests: true, runner: ubuntu-26.04}
           - {family: clang, version: 18, modules: false, doc_tests: true, runner: ubuntu-26.04}
           - {family: clang, version: 19, modules: false, doc_tests: true, runner: ubuntu-26.04}
           - {family: clang, version: 20, modules: true, doc_tests: true, runner: ubuntu-26.04}
           - {family: clang, version: 21, modules: true, doc_tests: true, runner: ubuntu-26.04}
+          - {family: clang, version: 22, modules: true, doc_tests: true, runner: ubuntu-26.04}
 
     steps:
     - uses: actions/checkout@v7

.github/workflows/bvt-gcc.yml

@@ -2,59 +2,63 @@ on:
   workflow_call:
   workflow_dispatch:
 
+env:
+  GCC_VERSION: 16
+
 jobs:
   bvt-gcc:
     runs-on: ubuntu-26.04
-    container: gcc:16
     steps:
     - uses: actions/checkout@v7
 
-    - name: Install CMake, Meson, and Bazelisk
+    - name: Install meson
+      run: pipx install meson
+
+    - name: Install gcc
       run: |
-        apt-get update
-        apt-get install -y cmake meson ninja-build curl
-        curl -fsSL -o /usr/local/bin/bazel \
-          https://github.com/bazelbuild/bazelisk/releases/download/v1.29.0/bazelisk-linux-amd64
-        chmod +x /usr/local/bin/bazel
+        sudo apt install -y "g++-$GCC_VERSION"
+        {
+          echo "CC=gcc-$GCC_VERSION"
+          echo "CXX=g++-$GCC_VERSION"
+        } >> "$GITHUB_ENV"
 
     - name: Check toolchain versions
       run: |
-        g++ --version
+        "$CXX" --version
         cmake --version
         ninja --version
         meson --version
         bazel version
 
-    - name: Build and run test with gcc 15 on cmake
+    - name: Build and run test with gcc ${{ env.GCC_VERSION }} on cmake
       run: |
         cmake --preset default -DCMAKE_CXX_STANDARD=23 -DPROXY_BUILD_MODULES=TRUE
         cmake --build --preset default -j
         ctest --preset default -j
         mkdir build/cmake/drop
-        chmod +x tools/dump_build_env.sh
-        ./tools/dump_build_env.sh g++ build/cmake/drop/env-info.json
+        bash ./tools/dump_build_env.sh "$CXX" build/cmake/drop/env-info.json
 
-    - name: Build and run freestanding test with gcc 15 on cmake
+    - name: Build and run freestanding test with gcc ${{ env.GCC_VERSION }} on cmake
       run: |
         cmake --preset freestanding -DCMAKE_CXX_STANDARD=23 -DPROXY_BUILD_MODULES=TRUE
         cmake --build --preset freestanding -j
         ctest --preset freestanding -j
 
-    - name: Build and run test with gcc 15 on meson
+    - name: Build and run test with gcc ${{ env.GCC_VERSION }} on meson
       run: |
         meson setup build/meson --buildtype=release -Dtests=enabled -Dbenchmarks=enabled
         meson test -C build/meson
         meson test -C build/meson --benchmark --test-args=--benchmark_list_tests=true
 
-    - name: Build and run freestanding test with gcc 15 on meson
+    - name: Build and run freestanding test with gcc ${{ env.GCC_VERSION }} on meson
       run: |
         meson setup build/meson-freestanding --buildtype=release -Dfreestanding=true
         meson test -C build/meson-freestanding
 
-    - name: Build and Run test with gcc 15 on bazel
+    - name: Build and Run test with gcc ${{ env.GCC_VERSION }} on bazel
       run: bazel test --lockfile_mode=error //tests:proxy_tests //benchmarks:proxy_benchmarks //docs/...
 
-    - name: Build and run freestanding test with gcc 15 on bazel
+    - name: Build and run freestanding test with gcc ${{ env.GCC_VERSION }} on bazel
       run: bazel test --config=freestanding --lockfile_mode=error //tests:proxy_freestanding_tests
 
     - name: Run benchmarks