Add resources for unicorn dependencies initContainer

I ran into an OOMKilled when deploying the unicorn chart with resource limits.

Example error message:

  dependencies:
    Container ID:  docker://0f603e3e14304b71b7ffeda8be92393b618d22d1f08b0f690e490fa44ce2cb0e
    Image:         registry.gitlab.com/gitlab-org/build/cng/gitlab-unicorn-ee:v11.0.1
    Image ID:      docker-pullable://registry.gitlab.com/gitlab-org/build/cng/gitlab-unicorn-ee@sha256:d99ec11683f25b5ef703ed2017fa253a87ddf4cd2835c553053bf762208da44a
    Port:          <none>
    Args:
      /scripts/wait-for-deps
    State:          Running
      Started:      Wed, 27 Jun 2018 15:03:06 +0000
    Last State:     Terminated
      Reason:       OOMKilled
      Exit Code:    1
      Started:      Wed, 27 Jun 2018 14:50:44 +0000
      Finished:     Wed, 27 Jun 2018 15:03:04 +0000