cache Docker build in MingW workflow (#41736)

.github/workflows/minw64.yml → .github/workflows/mingw64.yml

@@ -34,7 +34,16 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Build Docker Container with Build Environment
-        run: docker build -t qgis3-mingw-buildenv -f ms-windows/mingw/qgis3-build-deps-mingw.dockerfile .
+        id: docker-build
+        uses: whoan/docker-build-with-cache-action@v5
+        with:
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+          registry: docker.pkg.github.com
+          image_name: qgis3-mingw-buildenv
+          dockerfile: ms-windows/mingw/qgis3-build-deps-mingw.dockerfile
+          push_git_tag: true
+          push_image_and_stages: on:push
 
       - name: Prepare build cache for pull request
         uses: pat-s/always-upload-cache@v2.1.3
@@ -68,8 +77,10 @@ jobs:
             --env CCACHE_DIR=/QGIS/.ccache \
             -w /QGIS \
             -v ${GITHUB_WORKSPACE}:/QGIS \
-            qgis3-mingw-buildenv \
+            ${DOCKER_IMAGE} \
             ms-windows/mingw/build.sh x86_64 nodebug 4
+        env:
+          DOCKER_IMAGE: ${{ steps.docker-build.outputs.FULL_IMAGE_NAME }}
 
       - name: Create Portable zip
         run: |