How to trigger a Netlify build of another repo in a module repo's GitHub Action

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As promised, I have a full write up:

For those who don’t want to read the whole thing, I show the table of contents, which make a nice outline of the steps involved:

  1. Preface
    1. Prerequisites
  2. Moving the large files out of the module
    1. Make a copy of the test site, elsewhere
    2. Make a list of any LFS files you wish to remove
    3. Remove references to unwanted files from CI
    4. Remove unwanted files and references to them
    5. Obliterate the large files
      1. Use git-filter-repo or similar tool
      2. For LFS, have the remote admin remove the LFS files
  3. Create a new Hugo module repo with the site
    1. Make sure the main module repository still works
  4. Use a subdirectory of the module as a ‘site’
    1. Add a site config in a subdirectory of the module
    2. Initialize exampleSite as a Hugo module
    3. Activate any modules from the config.toml
    4. Test with the Hugo local server
  5. Create a build script for use with Netlify
  6. Deploy on Netlify
  7. Set your GitHub branch protection rules to require successful deploy
  8. Remember to git rebase not git merge or git pull any existing branches
  9. Conclusion

I hope this can be of use to others.