fix(CI): push Docker image

Author: kkweon

.github/workflows/go.yml

@@ -86,3 +86,4 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}