Feat GitHub actions before_script and after_script steps

[costrouc]

Reference Issues or PRs

Closes #1671

What does this implement/fix?

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Any other comments?

This is required for Quansight's move towards oidc github-actions authentication.

[costrouc]

This is an important issue to merge since it is blocking fixing integration tests.

[iameskild]

Thanks for this helpful enhancement @costrouc!

The only change I think we might make is modifying the git add . command to be more precise. This will help us avoid having the script commit extra files (ie. credentials files).

We might want to specify git add ./.github ./stages.

[iameskild]

LGTM :)