Merge pull request #138 from vladgh:filters

Do not build images that are not changed

.github/workflows/build.yml

@@ -35,9 +35,17 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/[email protected]
+      - name: Detect changes
+        uses: dorny/[email protected]
+        id: filter
+        with:
+          filters: |
+            build:
+              - ${{ matrix.image.path }}/!(**.md)
       - name: Docker Metadata
         uses: docker/[email protected]
         id: meta
+        if: steps.filter.outputs.build == 'true'
         with:
           images: ${{ matrix.image.name }}
           tags: |
@@ -50,16 +58,19 @@ jobs:
             type=sha
       - name: Set up QEMU
         uses: docker/[email protected]
+        if: steps.filter.outputs.build == 'true'
       - name: Set up Docker BuildX
         uses: docker/[email protected]
+        if: steps.filter.outputs.build == 'true'
       - name: Login to DockerHub
         uses: docker/[email protected]
-        if: github.event_name != 'pull_request'
+        if: github.event_name != 'pull_request' && steps.filter.outputs.build == 'true'
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       - name: Build and push
         uses: docker/[email protected]
+        if: steps.filter.outputs.build == 'true'
         with:
           context: ${{ matrix.image.path }}
           platforms: ${{ matrix.image.platforms }}