ci: add workflow for building SDL on ppc64le

.github/workflows/ppc64le.yml

@@ -0,0 +1,60 @@
+name: Build (PowerPC64)
+
+on: [push, pull_request]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  ppc64le:
+    runs-on: ubuntu-latest
+    container:
+      image: dockcross/linux-ppc64le:latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install build requirements
+        run: |
+          apt-get update -y
+          apt-get install -y cmake ninja-build
+      - name: Configure (CMake)
+        run: |
+          # FIXME: Enable SDL_WERROR
+          cmake -S . -B build -G Ninja \
+            -Wdeprecated -Wdev -Werror \
+            -DSDL_SHARED=ON \
+            -DSDL_STATIC=ON \
+            -DSDL_TESTS=ON \
+            -DSDL_WERROR=OFF \
+            -DSDL_TESTS=ON \
+            -DSDL_INSTALL_TESTS=ON \
+            -DSDL_VENDOR_INFO="Github Workflow" \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DCMAKE_INSTALL_PREFIX=prefix
+      - name: Build (CMake)
+        run: |
+          cmake --build build --verbose
+      - name: Install (CMake)
+        run: |
+          echo "SDL3_DIR=$(pwd)/prefix" >> $GITHUB_ENV
+          cmake --install build/
+          ( cd prefix; find ) | LC_ALL=C sort -u
+      - name: Package (CPack)
+        run: |
+          cmake --build build/ --config Release --target package
+      - name: Verify CMake configuration files
+        run: |
+          cmake -S cmake/test -B cmake_config_build -G Ninja \
+            -DTEST_SHARED=FALSE \
+            -DCMAKE_PREFIX_PATH=${{ env.SDL3_DIR }} \
+            -DCMAKE_BUILD_TYPE=Release
+          cmake --build cmake_config_build --verbose
+      - name: Verify sdl3.pc
+        run: |
+          export PKG_CONFIG_PATH=${{ env.SDL3_DIR }}/lib/pkgconfig
+          cmake/test/test_pkgconfig.sh
+      - uses: actions/upload-artifact@v3
+        with:
+          if-no-files-found: error
+          name: SDL-ppc64le
+          path: build/dist/SDL3*