Add weekly build and release process

[Zhangbaowen-Hashdata]

We'll schedule weekly builds and releases to start every Monday morning.
During this process, we'll compile the CBDB RPM package from its source
and tag the latest commit to generate a release note automatically.

fix #ISSUE_Number

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Change logs

Describe your change clearly, including what problem is being solved or what feature is being added.

If it has some breaking backward or forward compatibility, please clary.

Why are the changes needed?

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Does this PR introduce any user-facing change?

no

How was this patch tested?

Please detail how the changes were tested, including manual tests and any relevant unit or integration tests.

Contributor's Checklist

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• Make sure your Pull Request has a clear title and commit message. You can take git-commit template as a reference.
• Sign the Contributor License Agreement as prompted for your first-time contribution(One-time setup).
• Learn the coding contribution guide, including our code conventions, workflow and more.
• List your communication in the GitHub Issues or Discussions (if has or needed).
• Document changes.
• Add tests for the change
• Pass make installcheck
• Pass make -C src/test installcheck-cbdb-parallel
• Feel free to request cloudberrydb/dev team for review and approval when your PR is ready🥳