feat(docker): Update entrypoint

[khvn26]

Thanks for submitting a PR! Please check the boxes below:

• [x] I have run pre-commit to check linting
• [x] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
• [x] I have used a Conventional Commit title for this Pull Request

Changes

• Allow arbitrary Django commands
• Remove redundant commands
• Remove deprecated go_to_sleep

How did you test this code?

Ran Docker build locally and verified arbitrary Django commands work.