Failure when getting containers for CI: Too many requests

[jhenin]

https://github.com/Colvars/colvars/actions/runs/13761397379/job/38478255907

Is there a way to reduce the number of times we pull the containers to run CI tests?
Maybe merge some of the tests that use the same container?

[giacomofiorin]

This kind of failure was sporadic in my experience. Feel free to merge some of the tests, but keep an eye out for those that are a lot slower when the cache is invalidated (like the multiple GCC and Clang one)

[giacomofiorin]

This kind of failure was sporadic in my experience. Feel free to merge some of the tests, but keep an eye out for those that are a lot slower when the cache is invalidated (like the multiple GCC and Clang one)

Or better yet, try the download a small number of times before giving up with error?