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.

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3 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **docs** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/docs/CHas2EoXoaadRdnYLQTo143uff7k)) | [Visit Preview](https://docs-git-feat-update-entrypoint-flagsmith.vercel.app) | | Jun 28, 2024 7:35am | | **flagsmith-frontend-preview** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-preview/6zidWcKMKPn6zpSjDb4DwKqGFrZ7)) | [Visit Preview](https://flagsmith-frontend-preview-git-feat-update-entrypoint-flagsmith.vercel.app) | | Jun 28, 2024 7:35am | | **flagsmith-frontend-staging** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-staging/83txcLHWF9aKZNLgFeApLcSvUQiq)) | [Visit Preview](https://flagsmith-frontend-staging-git-feat-update-entrypoint-flagsmith.vercel.app) | | Jun 28, 2024 7:35am |

[github-actions[bot]]

Uffizzi Ephemeral Environment deployment-53584

:cloud: https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/4262

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.60%. Comparing base (bc9b340) to head (193894f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4262 +/- ## ======================================= Coverage 96.60% 96.60% ======================================= Files 1194 1194 Lines 39071 39071 ======================================= Hits 37745 37745 Misses 1326 1326 ```

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