fix(actions): make action use v2

.github/workflows/docker.yml

@@ -39,13 +39,13 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
       - name: Push to GitHub Packages
-        uses: docker/build-push-action@v1
+        uses: docker/build-push-action@v2
         with:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
           registry: docker.pkg.github.com
           repository: diced/zipline/zipline-arm
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/arm64
           dockerfile: Dockerfile.arm
           tag_with_ref: true