This commit introduces a new workflow for managing nightly builds, allowing
developers to include specific PRs in nightly releases by commenting on their
pull requests. This approach provides more control over what gets included in
nightly builds, enabling testing of features that aren't ready for the main
branch.
The workflow works by:
1. Adding a new action that listens for '/nightly' comments on PRs
2. Updating the comment with the specific commit SHA
3. Creating a 'nightly-train' branch that cherry-picks marked commits
4. Running the nightly build process on this 'nightly-train' branch
This system allows for more flexible and controlled nightly releases, improving
our ability to test and validate new features before they reach the main branch.
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