build: Support multi platform with qemu

Author: clafoutis42

.github/workflows/build-push.yaml

@@ -16,6 +16,9 @@ jobs:
         with:
           fetch-depth: 1
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -45,15 +48,10 @@ jobs:
         with:
           registry-type: public
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-        with:
-          platforms: "linux/amd64,linux/arm64"
-
       - name: Build & Push Image
         uses: docker/build-push-action@v6
         with:
-          load: true
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: ${{ steps.login-ecr-public.outputs.registry }}/${{ vars.ECS_REGISTRY_ALIAS }}/${{ vars.ECS_REPOSITORY_NAME }}:${{ steps.extract_refs.outputs.tag }}
           cache-from: type=local,src=/tmp/.buildx-cache