Initial Dockerfile for OCI catalog.

[absoludity]

Description of the change

Creating the Dockerfile for the stubbed service now so that we can start the process for getting an official image in the bitnami pipeline.

I'll have another attempt at a static build for a scratch image before making the request.

Benefits

We can communicate a working Dockerfile for the official Bitnami image to be based on.

Possible drawbacks

Applicable issues

• ref Implementation of OCI-Catalog gRPC micro-service #6263

Additional information

$ IMAGE_TAG=dev1 make kubeapps/oci-catalog
...
$ docker run -p 50051:50051 docker.io/kubeapps/oci-catalog:dev1 

then in a separate terminal

$  grpcurl -proto ./proto/ocicatalog.proto -d '{"repository": {"registry": "registry-1.docker.io"}}' -plaintext "127.0.0.1:50051" ocicatalog.OCICatalog.ListTagsForRepository
{
  "name": "tag-0"
}
{
  "name": "tag-1"
}
{
  "name": "tag-2"
}
{
  "name": "tag-3"
}
{
  "name": "tag-4"
}
{
  "name": "tag-5"
}
{
  "name": "tag-6"
}
{
  "name": "tag-7"
}
{
  "name": "tag-8"
}
{
  "name": "tag-9"
}

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