kubectl-delivery's Dockerfile fails in distroless

[terrytangyuan]

Thanks @audriusrudalevicius for bringing this up in #196 (comment).

Currently cmd/kubectl-delivery/Dockerfile has ENTRYPOINT ["/bin/sh", "-c"] which fails in distroless image:

docker run -it --rm --entrypoint=/bin/sh gcr.io/distroless/base-debian10
docker: Error response from daemon: OCI runtime create failed: container_linux.go:346: starting container process caused "exec: \"/bin/sh\": stat /bin/sh: no such file or directory": unknown.

Also cc @carmark

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[rongou]

Actually the build itself is failing on docker hub: https://hub.docker.com/repository/registry-1.docker.io/mpioperator/kubectl-delivery/builds/95d784bf-c540-40fe-a5bb-6438176be6a7

[terrytangyuan]

@rongou Would it be a problem of running builds on your fork rongou/mpi-operator? Building it locally seems successful.

[terrytangyuan]

The dockerfile here seems outdated: https://hub.docker.com/r/mpioperator/kubectl-delivery/dockerfile

[rongou]

Ok I fixed the build. It's a configuration issue on dockerhub.

As for the failure, perhaps we shouldn't use distroless in this case as the main thing the container is doing is to copy a file.