Build Docker image for ARM (#9)

Same as WATonomous/repo-ingestion#1

.github/workflows/push-image.yml

@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - main
+  pull_request:
+    branches:
+      - main
 
 env:
   IMAGE_NAME: ${{ github.repository }}
@@ -29,18 +32,28 @@ jobs:
           username: ${{ env.REGISTRY_USER }}
           password: ${{ env.REGISTRY_PASSWORD }}
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@988b5a0280414f521da01fcc63a27aeeb4b104db
+
       - name: Extract metadata (tags, labels) for Docker
         id: meta
         uses: docker/metadata-action@c4ee3adeed93b1fa6a762f209fb01608c1a22f1e
         with:
           images: ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=sha,format=long
 
       - name: Build and push Docker image
         uses: docker/build-push-action@91df6b874e498451163feb47610c87c4a218c1ee
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           push: true
           build-args: |
             DOCKER_METADATA_OUTPUT_JSON
           tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+          labels: ${{ steps.meta.outputs.labels }}