Add a context to github action so that it doesn't try to pull
We used the actions/checkout@v2 action to pull. That one can
successfully pull the submodules. The build-push-action one fails to
pull them.
More here:
@@ -24,6 +24,7 @@ jobs:
id: docker_build
uses: docker/build-push-action@v2
with:
+ context: .
push: true
file: images/linkerd-Dockerfile
tags: splatform/epinio-linkerd:2.10.2
