Fork-friendly CI

[wallentx]

I may open a PR for this if I get time, but wanted to note that the CI should be adjusted so PR checks can run successfully on forks. Jobs or workflows that are only relevant within the Chia-Network org should be conditionally skipped.

jobs:
  publish:
    if: github.repository_owner == 'Chia-Network'

See chia-blockchain#19807 for a similar approach.