fix(ci): Secrets unavailable to Docker publish jobs

[khvn26]

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Changes

This fixes the Docker Publish actions unable to run because of insufficient access to repo secrets. This also adds args to the E2E run performed on merge to main and release.

How did you test this code?

This is a CI change.

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3 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **docs** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/docs/3mFpBFTsCguWdqBkZiBCFbPHmkGj)) | [Visit Preview](https://docs-git-fix-secrets-docker-publish-flagsmith.vercel.app) | | Jun 25, 2024 10:16am | | **flagsmith-frontend-preview** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-preview/CPsLsBhXvvM24X9vZasPLUFTKzjk)) | [Visit Preview](https://flagsmith-frontend-preview-git-fix-secrets-doc-4ddfdd-flagsmith.vercel.app) | | Jun 25, 2024 10:16am | | **flagsmith-frontend-staging** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-staging/6ThcMXyPXenC8nr1st5UmgEdJQR5)) | [Visit Preview](https://flagsmith-frontend-staging-git-fix-secrets-doc-1c6a48-flagsmith.vercel.app) | | Jun 25, 2024 10:16am |

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[codecov[bot]]

Codecov Report

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

Project coverage is 96.57%. Comparing base (5c25c41) to head (4e38ba3). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4220 +/- ## ======================================= Coverage 96.57% 96.57% ======================================= Files 1190 1190 Lines 38747 38747 ======================================= Hits 37419 37419 Misses 1328 1328 ```

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