I've often thought about this. There are times I would rather have CI run locally, and use my PGP signature to add a git note to the commit. Something like:

``` echo "CI passed" | gpg2 --clearsign --output=- | git notes add -F- ```

Then CI could check git notes and check the dev signature, and skip the workflow/pipeline if correctly signed. With more local CI, the incentive may shift to buying devs fancier machines instead of spending that money on cloud CI. I bet most devs have extra cores to spare and would not mind having a beefier dev machine.