Add support for linux/arm/v7 platform in Docker build workflow

.github/workflows/docker-build-and-push.yml

@@ -58,6 +58,9 @@ jobs:
   build-and-push:
     runs-on: ubuntu-latest
     needs: test
+    strategy:
+      matrix:
+        platform: [linux/amd64, linux/arm64, linux/arm/v7]
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
@@ -91,7 +94,7 @@ jobs:
         uses: docker/build-push-action@v4
         with:
           context: .
-          platforms: linux/amd64,linux/arm64
+          platforms: ${{ matrix.platform }}
           push: ${{ github.event_name != 'pull_request' }}
           cache-from: type=gha
           cache-to: type=gha,mode=max