My recent commit to fix the stack cache on macOS only changed the
restore keys, but no cache would ever be saved that way. I effectively
disabled all caching...
We now have two stack jobs for macOS, but they use the same cache, which
is very inefficient. Adding the architecture to the cache key will give
each of these jobs a separate cache.
This is a first step to split up the cabal and stack caches in separate
pieces. Here we split the work folder, which just contains the
postgrest-specific build artifacts, into a separate cache.
More fine-grained caching should give us better cache hits and much
fewer upload size in the regular case, improving CI performance.
Since the work file caches are very small (about 30-40 MB) they are
cached for PRs, too. This will allow the majority of PRs, which only
change source code files, but no dependencies, to still have cached
their build files for additional commits.
This restores caches on all branches and pull requests, but only stores
them on the main branch and release branches. This prevents those caches
from being evicted early when we hit the 10 GB limit quickly.
