[operator] enable bashrc before container start

[Basasuya]

Why are these changes needed?

The ray cluster will not load the .bashrc before the container start. The reason is the ray process starting command is like this:

    Command:
      /bin/bash
      -c
      --
    Args:
      ulimit -n 65536; ray start --head  --system-config='{"gcs_rpc_server_reconnect_timeout_s": 20}'  --block  --num-cpus=4  --memory=8000000000  --dashboard-host=0.0.0.0  --node-ip-address=$MY_POD_IP  --port=6379  --metrics-export-port=8080

/bin/bash -c means non-Interactive mode to run bash.
reference to https://www.gnu.org/software/bash/manual/bash.html#Bash-Startup-Files
non-Interactive mode would not load /etc/profile, .bashrc, ...
we can use login mode to get similar effect with the interactive mode

Related issue number

#409

Checks

• [*] I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • [*] Manual tests
  • This PR is not tested :(

[akanso]

can you please elaborate more on what you mean by "iterative" in the title? your comment says "interactive"

   -i     If the -i option is present, the shell is interactive.
   -l     Make bash act as if it had been invoked as a login shell
          (see INVOCATION below).

https://www.man7.org/linux/man-pages/man1/bash.1.html

[Basasuya]

@akanso sorry for the unclear expression. I have updated the comment.
I want to use the login shell(-l) to enable interactive login shell, which would load .bashrc before process start

[Jeffwan]

@akanso does the commit message look good to you?

[akanso]

looks good to me.