Find a way to guarantee CI tests are always up to date

[lkct]

#59 and #58 caused conflicts that were not captured by CI. Also ref the fix: #62.

We should implement some mechanisms to guarantee this will not happen in the future.

[loreloc]

Perhaps we can run tests after merging to main too.

[lkct]

https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/managing-protected-branches/about-protected-branches#require-status-checks-before-merging

[lkct]

"Always suggest updating pull request branches" is now enabled by @arranger1044. This provides a button to update branch if not synced with main.

We consider this issue resolved for now. Follow-up is tracked by #77.