ci: add skip publish on fork pr builds

[seantronsen]

Description

Adds a build/publish check for fork PRs.

Checklist

• My code follows the style guidelines of this project
• I have added/updated comments where needed
• I have added tests that prove my fix is effective or my feature works
• I have run make test (or equivalent) locally and all tests pass
• I have updated the relevant documentation (CLI examples, man pages, README, other docs, etc.)
• DCO Sign-off: All commits are signed off (git commit -s) with my real name and email
• REUSE Compliance:
  • Each new/modified source file has SPDX copyright and license headers
  • Any non-commentable files include a <filename>.license sidecar
  • All referenced licenses are present in the LICENSES/ directory

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Dependency update
• Build system/CI

---

• I agree to follow the Code of Conduct.

[synackd]

This is marked as a WIP. Is this ready for review or is this still being worked on?

[seantronsen]

This is marked as a WIP. Is this ready for review or is this still being worked on?

whoops. good catch. artifact from the commit this morning. I decided after I got home that I'd split into multiple PRs to simplify review efforts.

TLDR: it's good to go. I renamed the commit to promote sanity @synackd .