Body filepath

[pacostas]

Summary

With this PR, we extend the functionality of the create release action by passing through the newly added option body-filepath, a string that points to the file that has the release notes instead of passing/storing the release notes on the body argument. Specifically, the current functionality as is, allows to pass the body of the release notes through the body argument of the action. We extend this functionality by introducing a new argument called body-filepath which points to a file to read from the release notes. This is useful in case we want to ensure that we don't reach the shell arguments limit which results in the too many arguments error. The body-filepath extra argument is optional and has a priority only when the body argument is empty and the body-filepath is not.

• We already use this action in our stack workflow https://github.com/paketo-community/ubi-base-stack/blob/main/actions/release/create/entrypoint/main.go

• It does not change the default behaviour

Use Cases

With this PR we ensure that no error will occur in case of a newly added stack produces too many changes, e.g., on the added packages of the build and run image.

Checklist

• [x] I have viewed, signed, and submitted the Contributor License Agreement.
• [ ] I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• [x] I have added an integration test, if necessary.
• [x] I have reviewed the styleguide for guidance on my code quality.
• [x] I'm happy with the commit history on this PR (I have rebased/squashed as needed).

[pacostas]

@ForestEckhardt Can you take a look whenever you have time?