switch back to explicit docker create/exec commands instead of 'conta…

…iner' option

The container option doesn't support QEMU emulation and thus selecting a architecture
different from the runners/host's one crashed the container with a 'exec format error'.

Unfortunately this breaks running the workflows locally using nektos/act. I still have
to figure out why exactly.

.github/workflows/build_and_test.yaml

@@ -17,29 +17,52 @@ jobs:
   build:
     name: ${{ format('Ubuntu {0}, {1}', matrix.UBUNTU_VERSION, matrix.ARCH) }}
     runs-on: ubuntu-latest
-    container:
-      image: 'unistuttgartdae/fans-ci:${{ matrix.UBUNTU_VERSION }}'
-      options: ${{ github.actor != 'nektos/act' && format('--platform=linux/{0}', matrix.ARCH) || '' }}
-    defaults:
-      run:
-        shell: "bash --login -eo pipefail {0}"
+    env:
+      FANS_DIR: /FANS
+      FANS_IMG: unistuttgartdae/fans-ci
+      FANS_CONTAINER: fans-ci
+      FANS_BUILD_DIR: build
     strategy:
       fail-fast: false
       matrix:
-        ARCH: ${{ fromJson(github.actor != 'nektos/act' && '["amd64", "arm64"]' || '["host-arch"]') }}
+        ARCH: [amd64, arm64]
         UBUNTU_VERSION: [noble, jammy, focal]
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Create and start container
+        run: |
+          docker create \
+            --name ${{ env.FANS_CONTAINER }} \
+            --platform linux/${{ matrix.ARCH }} \
+            -i -t \
+            -u `id -u`:`id -g` \
+            -v /etc/localtime:/etc/localtime:ro \
+            -v /etc/timezone:/etc/timezone:ro \
+            -v ${{ github.workspace }}:${{ env.FANS_DIR }} \
+            -w ${{ env.FANS_DIR }} \
+            ${{ env.FANS_IMG }}:${{ matrix.UBUNTU_VERSION }}
+          docker start ${{ env.FANS_CONTAINER }}
+
       - name: Generate build directory
-        run: mkdir -p build
+        run: |
+          docker exec \
+            -w ${{ env.FANS_DIR }} \
+            ${{ env.FANS_CONTAINER }} \
+            bash -c "mkdir -p ${{ env.FANS_BUILD_DIR }}"
 
       - name: Configure
-        working-directory: build
         run: |
-          cmake --version
-          cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXPORT_COMPILE_COMMANDS=ON ..
+          docker exec \
+            -w ${{ env.FANS_DIR }}/${{ env.FANS_BUILD_DIR }} \
+            ${{ env.FANS_CONTAINER }} \
+            bash -c " \
+              cmake --version && \
+              cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXPORT_COMPILE_COMMANDS=ON .."
 
       - uses: actions/upload-artifact@v4
         if: failure()
@@ -58,15 +81,19 @@ jobs:
           path: build/compile_commands.json
 
       - name: Compile
-        working-directory: build
         run: |
-          cmake --build . -j $(nproc) || cmake --build . -j1
+          docker exec \
+            -w ${{ env.FANS_DIR }}/${{ env.FANS_BUILD_DIR }} \
+            ${{ env.FANS_CONTAINER }} \
+            cmake --build . -j $(nproc) || cmake --build . -j1
       
       - name: Tests
-        env:
-          CTEST_OUTPUT_ON_FAILURE: 1
-        working-directory: build
-        run: ctest
+        run: |
+          docker exec \
+            -w ${{ env.FANS_DIR }}/${{ env.FANS_BUILD_DIR }} \
+            -e CTEST_OUTPUT_ON_FAILURE=1 \
+            ${{ env.FANS_CONTAINER }} \
+            ctest
 
       - uses: actions/upload-artifact@v4
         if: failure()