I am defining a Kubernetes job to run a rake task but stuck in how to write the command...

I am new to K8s and trying to run a Rails application in K8s. In my Rails app Dockerfile, I created a user , copied code to /home/abc and installed rvm and rails in this user, and also specified an entrypoint and command:

ENTRYPOINT ["/home/abc/docker-entrypoint.sh"]
CMD bash -l -c "cd /home/abc && rvm use 2.2.10 --default && rake db:migrate && exec /usr/bin/supervisord -c config/supervisord.conf"

In docker-entrypoint.sh, the last command is

exec gosu abc "$@"

The goal is to at the end, gosu to user abc, and then run db migration and start the server through supervisord. It works, although I dont know whether it is a good practice or not...

Now I would like to run another rake task for some purpose. Firstly, I tried to run it using kubectl exec command:

kubectl exec my-app-deployment-xxxx -- gosu abc bash -l -c 'cd /home/abc && rvm use 2.2.10 --default && rake app:init:test_task'

It worked, but it requires to know the pod id, which is dynamic. so I tried to create a K8s job and specify in the command:

containers:
- name: my-app
  image: my-app:v0.2
  command: 
  - "gosu"
  - "abc"
  - "bash -l -c 'cd /home/abc && rvm use 2.2.10 --default && rake app:init:test_task'"

I expect the job can be completed successfully, but it failed, and the error info when kubectl logs job_pod is like:

error: exec: "bash -l -c 'cd /home/abc && rvm use 2.2.10 --default && rake app:init:test_task'": stat bash -l -c cd /home/abc && rvm use 2.2.10 --default && rake app:init:test_task': no such file or directory

I think it should be because of how to write the 'command' part to run multiple commands with gosu...

Thanks for your help!