Create gh-actions-cache.yml

[Lohita9]

A repository can have multiple pull requests with their own caches, leading to a shortage of cache storage. The cache eviction policy automatically removes the oldest caches to make space. To prevent cache thrashing, workflows can be set up to delete caches faster than the eviction policy. This can be achieved using the gh-actions-cache CLI extension, which enables the deletion of caches for specific branches.

[iBotPeaches]

Sorry I don't think this is needed. We are a low PR repo and I only see 1.5 pages of cache items. I'd prefer to let the natural cache eviction systems take place.

I don't see any thrashing because we are not blowing out our own master cache.

Thanks though!