ci: add ARM64 docker image

Co-authored-by: @jhaeu

Author: aoles

.github/workflows/ci.yml

@@ -50,8 +50,12 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push Docker image
-        run: |
-          docker buildx create --use
-          docker buildx build \
-            --tag heigit/osm-transform:latest \
-            --push .
+        uses: docker/[email protected]
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64/v8
+          provenance: false
+          push: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          tags: heigit/osm-transform:latest