Index entries in action cache directory by SHA

[ChemiCalChems]

Previously they were indexed by ref name, which could be a SHA or a tag/branch name, but if a branch name was used and that branch was updated, the new reusable workflow action wouldn't be pulled.

This meant the user would have to delete the associated cache entry to be able to use the new version of the reusable workflow. If the user really wants stability, they should specify the reusable workflow by
SHA instead of by branch name/tag.

Ready to merge on my side.

[ChristopherHX]

IMHO checking out a single repo for every sha (or even ref) and clone into independent folders is a waste of storage space, clone time and much more.

That a branch fails to update is a bug of that implementation, that should be able to update it's worktree

My newer implementation of the action cache no longer

• has any worktree
• has more than one clone per repository

I'm all in for removal of the whole old logic that has this defect.

planned full transition stopped for the time being, I'm neutral here you can proceed supporting this

[ChemiCalChems]

@ChristopherHX I agree that using the new action cache would be better, but since as you said for the time being a full transition won't be happening, I believe it's important to support this. I initially faced this issue when using Gitea's action runner which is used for CI/CD, not just local running of actions, which is forked from this, and there it was a PITA to remove the cache.

I also noticed I wasn't using the run context auth token to perform the listing operation, hence the PR update.

[codecov]

Codecov Report

Attention: Patch coverage is 60.71429% with 11 lines in your changes missing coverage. Please review.

Project coverage is 68.55%. Comparing base (5a80a04) to head (5dba7bf).
Report is 168 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/common/git/git.go	63.63%	6 Missing and 2 partials ⚠️
pkg/runner/reusable_workflow.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2658      +/-   ##
==========================================
+ Coverage   61.56%   68.55%   +6.99%     
==========================================
  Files          53       72      +19     
  Lines        9002    11070    +2068     
==========================================
+ Hits         5542     7589    +2047     
+ Misses       3020     2908     -112     
- Partials      440      573     +133     

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