- Update Alpine version for Docker container to v3.22.1

- Updated GH Actions script to cross-compile amd64 and arm64 images
- Updated GH Actions modules to latest versions
- Bumped version number in app.py

.github/workflows/build_image.yml

@@ -18,10 +18,10 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5.0.0
 
       - name: Log in to the Container registry
-        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        uses: docker/login-action@v3.5.0
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
@@ -29,14 +29,15 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        uses: docker/metadata-action@v5.8.0
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        uses: docker/build-push-action@v6.18.0
         with:
           context: .
+          platforms: linux/amd64, linux/arm64
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}