CI: add scheduled Docker builds workflow

[dlachaume]

Content

This PR includes the introduction of a scheduled Docker builds workflow, set to run daily at 2:00 AM UTC, with the option to trigger it manually.

Pre-submit checklist

• Branch
  • [ ] Tests are provided (if possible)
  • [ ] Crates versions are updated (if relevant)
  • [ ] CHANGELOG file is updated (if relevant)
  • [x] Commit sequence broadly makes sense
  • [x] Key commits have useful messages
• PR
  • [x] No clippy warnings in the CI
  • [x] Self-reviewed the diff
  • [x] Useful pull request description
  • [x] Reviewer requested
• Documentation
  • [ ] Update README file (if relevant)
  • [ ] Update documentation website (if relevant)
  • [ ] Add dev blog post (if relevant)

Issue(s)

Closes #2026

[github-actions[bot]]

Test Results

    4 files  ±0     51 suites  ±0   10m 24s ⏱️ -11s 1 400 tests ±0  1 400 ✅ ±0  0 💤 ±0  0 ❌ ±0  1 611 runs  ±0  1 611 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit c21fae34. ± Comparison against base commit 1bdd8735.

:recycle: This comment has been updated with latest results.