What is the command that is executed in the container? --name and --cookie are arguments to the elixir or iex command. If you built a release try working with env vars instead of args:
env:
- name: MY_POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
- name: RELEASE_DISTRIBUTION
value: name
- name: RELEASE_NODE
value: foo@$(MY_POD_IP)
- name: RELEASE_COOKIE
value: foo-cookie
