message: ci: fix proxyd publish
  Updates the github action to properly reference
  the `proxyd` dockerfile. The logic is copied from
  the canary publish github action.
diff: @@ -194,8 +194,8 @@ jobs:
  - name: Build and push
  uses: docker/build-push-action@v2
  with:
  - context: ./go/proxyd
  - file: ./Dockerfile
  + context: .
  + file: ./go/proxyd/Dockerfile
  push: true
  tags: ethereumoptimism/proxyd:${{ needs.release.outputs.proxyd }},ethereumoptimism/proxyd:latest
  build-args: |
  