ci: remove EOL OS versions from workflows (#6388)

* CI: remove EOL OS versions from workflows

- freebsd.yml: drop FreeBSD 13.5 (EOL Jan 2026); keep 14.3 and 15.0
- openbsd.yml: bump 7.5 → 7.8 (7.5 EOL ~Nov 2024); drop pinned gcc version
- i386.yml: replace Alpine 3.16 x86 (EOL May 2024) with i386/debian:bookworm (EOL Jun 2028)

* CI: install cmake from bookworm-backports for i386 workflow
* CI: fix OpenBSD workflow for 7.8
- Update vmactions/openbsd-vm v1.3.4 → v1.4.0 (supports 7.8)
- Drop GCC; use OpenBSD's built-in Clang (cc/c++) which is always in PATH
- Remove LD_LIBRARY_PATH workaround that was only needed for egcc

* CI: remove gmake from OpenBSD workflow

.github/workflows/freebsd.yml

@@ -45,7 +45,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        freebsd-version: ['13.5', '14.3', '15.0']
+        freebsd-version: ['14.3', '15.0']
 
     steps:
       - name: Checkout repository

.github/workflows/i386.yml

@@ -23,40 +23,49 @@ jobs:
       - name: Get Sources
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
-      - name: setup alpine
-        uses: jirutka/setup-alpine@ae3b3ddba35054804fc4a3507b519fa7e8152050 # v1
-        with:
-          arch: x86
-          packages: >
-            build-base
-            libaec-dev
-            libgit2-dev
-            cmake
+      - name: Start i386 container
+        run: |
+          docker run -d --name i386_build --platform linux/386 \
+            -e CTEST_OUTPUT_ON_FAILURE=1 \
+            -v "${{ github.workspace }}:/workspace" \
+            i386/debian:bookworm sleep infinity
+
+      - name: Install dependencies
+        run: |
+          docker exec i386_build bash -c "
+            echo 'deb http://deb.debian.org/debian bookworm-backports main' > /etc/apt/sources.list.d/backports.list
+            apt-get update -y
+            apt-get install -y build-essential libaec-dev libgit2-dev
+            apt-get install -y -t bookworm-backports cmake
+          "
 
       - name: Configure
-        shell: alpine.sh --root {0}
         run: |
-          mkdir build
-          cd build
-          cmake -C ../config/cmake/cacheinit.cmake -G "Unix Makefiles" \
-          --log-level=VERBOSE \
-          -DCMAKE_BUILD_TYPE=${{ inputs.build_mode }} \
-          -DHDF5_ENABLE_ZLIB_SUPPORT:BOOL=OFF \
-          -DHDF5_ENABLE_SZIP_SUPPORT:BOOL=OFF \
-          -DHDF5_ENABLE_PLUGIN_SUPPORT:BOOL=OFF \
-          -DHDF5_BUILD_CPP_LIB:BOOL=OFF \
-          -DHDF5_BUILD_FORTRAN:BOOL=OFF \
-          -DHDF5_BUILD_JAVA:BOOL=OFF \
-          ..
+          docker exec -w /workspace i386_build bash -c "
+            mkdir build
+            cd build
+            cmake -C ../config/cmake/cacheinit.cmake -G 'Unix Makefiles' \
+              --log-level=VERBOSE \
+              -DCMAKE_BUILD_TYPE=${{ inputs.build_mode }} \
+              -DHDF5_ENABLE_ZLIB_SUPPORT:BOOL=OFF \
+              -DHDF5_ENABLE_SZIP_SUPPORT:BOOL=OFF \
+              -DHDF5_ENABLE_PLUGIN_SUPPORT:BOOL=OFF \
+              -DHDF5_BUILD_CPP_LIB:BOOL=OFF \
+              -DHDF5_BUILD_FORTRAN:BOOL=OFF \
+              -DHDF5_BUILD_JAVA:BOOL=OFF \
+              ..
+          "
 
       - name: Build
-        shell: alpine.sh --root {0}
         run: |
-          cmake --build . --parallel 3 --config ${{ inputs.build_mode }}
-        working-directory: build
+          docker exec -w /workspace/build i386_build \
+            cmake --build . --parallel 3 --config ${{ inputs.build_mode }}
 
       - name: Run Tests
-        shell: alpine.sh --root {0}
         run: |
-          ctest . --parallel 2 -C ${{ inputs.build_mode }}
-        working-directory: build
+          docker exec -w /workspace/build i386_build \
+            ctest . --parallel 2 -C ${{ inputs.build_mode }}
+
+      - name: Cleanup
+        if: always()
+        run: docker rm -f i386_build

.github/workflows/openbsd.yml

@@ -45,26 +45,23 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        openbsd-version: ['7.5']
+        openbsd-version: ['7.8']
 
     steps:
       - name: Checkout repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Build and test on OpenBSD
-        uses: vmactions/openbsd-vm@271a1ba62300483cfc58345ff9f425f1349a2cab # v1.3.4
+        uses: vmactions/openbsd-vm@d7d892b7b9ba97ed2747b0fc201be65037d64c3e # v1.4.0
         with:
           release: ${{ matrix.openbsd-version }}
           usesh: true
           prepare: |
             echo "https://ftp.openbsd.org/pub/OpenBSD" > /etc/installurl
-            pkg_add cmake gmake pkgconf curl gcc-11.2.0p11
+            pkg_add cmake pkgconf curl
           run: |
             set -e
 
-            # Set up library path for gcc
-            export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
-
             # Get number of processors (OpenBSD uses sysctl in /sbin)
             NPROC=$(/sbin/sysctl -n hw.ncpu)
             echo "Number of processors: $NPROC"
@@ -75,9 +72,6 @@ jobs:
             cmake -C ../config/cmake/cacheinit.cmake \
               --log-level=VERBOSE \
               -DCMAKE_BUILD_TYPE=Release \
-              -DCMAKE_C_COMPILER=egcc \
-              -DCMAKE_CXX_COMPILER=eg++ \
-              -DCMAKE_MAKE_PROGRAM=gmake \
               -DBUILD_SHARED_LIBS:BOOL=ON \
               -DHDF5_ENABLE_ALL_WARNINGS:BOOL=ON \
               -DHDF5_ENABLE_PARALLEL:BOOL=OFF \