I do not recommend storing compiled assets in the repo. That gets very messy. You're welcome to checkout our Github Actions over at GiveWP.

• Generate a zip on-the-fly from any branch/commit: https://github.com/impress-org/givewp-github-actions/blob/master/.github/workflows/generate-zip.yml
• Release to wp.org: https://github.com/impress-org/givewp-github-actions/blob/master/.github/workflows/wp-org-release.yml

This is our re-usable workflow repo, so it would work slightly different here, but the job steps are the same.