Same here, though I have seen builds working in public repos, mine is private, not sure if that makes a difference. Failed build (broken yml) is somehow failed and queued for the last 13 hours and the build after it is just pending and not starting.
Edit: Turns out that in my case there was still something broken with my yml file. Fixing that allows new builds to run.
Specifically I had this:
steps: - uses: actions/checkout@v1 with: submodules: recursive # missing name: here run: .\generate_projects.bat /vs2019
It's a known issue that github is working on, please contact private support at https://support.github.com/contact, thanks.