Just learned about act!
https://github.com/nektos/act
I always hated testing CI because it requires a cycle of:
1. write ci
2. commit and push
3. wait for ci to run
4. ci fails, fix error, go to 1
which is annoying especially when the CI is slow, and clutters your PR/commit history.
this tool allows you to run the same steps without the intermediate commit step (and on your own pc, which is generally faster most of the time)