Cache for cellfinder workflow tests

[sfmig]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
We are trying to speed up tests in CI. This PR adds a cache for the cellfinder workflow tests that run in CI.

What does this PR do?
Adds a cache step to the test job that runs in CI.

References

#65

How has this PR been tested?

Checks for this PR should pass.

Is this a breaking change?

No.

Does this PR require an update to the documentation?

No.

Checklist:

• [ n/a] The code has been tested locally
• [ n/a] Tests have been added to cover all new functionality (unit & integration)
• [ n/a] The documentation has been updated to reflect any changes
• [ x] The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.45%. Comparing base (b5f62ef) to head (2a7873c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   79.38%   84.45%   +5.06%     
==========================================
  Files          18       17       -1     
  Lines         917      862      -55     
==========================================
  Hits          728      728              
+ Misses        189      134      -55     

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[adamltyson]

@sfmig, naively, shouldn't this speed up the tests?

[sfmig]

@adamltyson yeah I was expecting at least a few minutes of improvement, but it seems I didn't implement it correctly. Will revert to draft.