agama-project / agama / 26234545328

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Updated CI caching (#3530)

## Problem

- The Ruby gems are not cached in unit tests, installing them takes like
90 seconds.
- The Rust unit test cache is huge (~3GB!!), saving the cache for each
branch causes reaching the 10GB storage GitHub limit. When the limit is
reached then GitHub starts removing the other Ruby, NPM, Rubocop...
caches which are much smaller. The result is that the Rust cache causes
the caching in other Actions pointless as the caches are usually not
present (have been deleted).

## Solution

- Port the Ruby gem caching from #3528 to master branch
- Enable the Rust unit test cache only in the master branch. (That is
also inherited to pull requests open against master so that should help
a bit also in the other branches.)

## Testing

- Tested by running the modified GitHub Action, see the results for this
pull request.

4259 of 6347 branches covered (67.1%)

Branch coverage included in aggregate %.

23601 of 28042 relevant lines covered (84.16%)

99.24 hits per line