ci: add scheduled workflow to clean caches #1805

1. 
   8144225309 commented at 0:02 am on January 23, 2026: none

   Add a cron job that deletes all GitHub Actions caches on the 1st and 15th of each month. This ensures the Docker images are rebuilt periodically with newer compiler snapshots (gcc-snapshot, clang-snapshot).

   The workflow:

   • Runs on the 1st and 15th of each month at 00:00 UTC
   • Can be triggered manually via workflow_dispatch
   • Deletes all caches using gh cache delete

   Fixes #1691

2. ci: add scheduled workflow to clean caches

   Add a cron job that deletes all GitHub Actions caches on the 1st and
   15th of each month. This ensures the Docker images are rebuilt
   periodically with newer compiler snapshots (gcc-snapshot, clang-snapshot).
   
   Fixes #1691

   895bda6b73
3. 8144225309 closed this on Jan 23, 2026

   ---

4. 
   real-or-random commented at 6:56 am on January 23, 2026: contributor

   This couls be a good change. Why are you closing the PR?
5. 
   8144225309 commented at 9:11 am on January 23, 2026: none

   I was practicing writing the PR professionally while I tested the solution and I accidently shipped it early. Feel free to use it or wait till monday at the latest for a replacement. I only want to push things I’ve personally tested and I made a mistake here with my setup.

   edit: Can reopen for git cleanliness.

6. 
   real-or-random commented at 9:25 am on January 23, 2026: contributor

   I only want to push things I’ve personally tested and I made a mistake here with my setup.

   Sure, that makes sense! I think my main point is that I’m suggesting to always state the rationale for closing a PR (because otherwise it is obvious to anyone else).

7. 
   8144225309 commented at 7:46 am on January 25, 2026: none

   Closed in favor of #1807, which uses gh cache delete --all instead of a manual loop.

Contributors
8144225309 real-or-random