fix: add image cleanup and update ci to build image on pr

[nnicora]

Summary by CodeRabbit

• Chores
  • Enhanced continuous integration pipeline to automatically build and publish container images for pull requests, streamlining development and testing.
  • Introduced automated nightly cleanup process for stale container images to optimize storage resources and reduce maintenance overhead.

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Walkthrough

This pull request modifies GitHub Actions workflows to add container image management capabilities. The ci.yaml workflow is updated with new packages: write permission and a new job that builds Docker images for pull requests using a reusable workflow. Additionally, a new standalone workflow file is introduced that automatically cleans up stale images nightly using a scheduled trigger at 02:00 AM UTC, along with a manual trigger option. Both workflows utilize reusable workflow files from an external repository and inherit secrets for authentication.

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