Problem

The CI is failing because the docker image cache is faulty (the size is too small to be complete):

https://github.com/apache/apisix/actions/runs/8356719685/job/22875292483?pr=11060#step:11:14

I suspect this is because on one of the previous CI runs, the cache write process was interrupted due to excess disk usage. Here is one example:

Solution

• leverage the script that frees disk space to free some more space by removing unnecessary packages.
• write another script (run before saving docker images) that frees disk space by removing some more packages.
  • since we save docker images after setting up the CI environment and running tests, this script can be more fierce on removing big files/packages as it is safer to remove them now
• ensure a mechanism that would abort the cache write process if it encounters any error so that cache is not incomplete.