Add policy document for using GitHub actions in workflows

[bjhargrave]

Closes https://github.com/instructlab/dev-docs/issues/12

[russellb]

I apologize for the inconvenience, but I had to force push an edit to main. You'll have to redo your branch with something like ...

git fetch origin
git checkout -b new-branch origin/main
git cherry-pick old-branch
git push your-repo new-branch:old-branch

[bjhargrave]

@russellb

Better solution is

git fetch origin
git rebase --onto origin/main main
git push --force fork

[russellb]

whatever works :)

it's going to break again once I flip the repo to public ... just fyi

[bjhargrave]

I think we should have conversation about some of the logistics of this before we merge.

I think this is the conversation :-)

[russellb]

@bjhargrave This PR will probably have to be re-posted from a public fork. Apologies for the disruption.

[bjhargrave]

Replaced by https://github.com/instructlab/dev-docs/pull/45