fix: Replace set-output command with environment files

[kieran-smith77]

Pull Request

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• pre-commit was run locally and any changes were pushed
• test/test.sh has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

entrypoint.sh currently uses set-output to return the output of sarifContentRepo. This creates a warning on any workflow currently using this action.

Issue URL: #1085

What is the new behavior?

• Replaces set-output with environment files in entrypoint.sh

Does this introduce a breaking change?

• Yes
• No

Other information

[martinm82]

Can we please approve and merge this PR

[github-actions]

This PR is stale because it has been open 45 days with no activity.

[tomwillis608]

Thanks for this code improvement