[DO NOT MERGE] Disable GitHub Actions cache

[takezoe]

This is just for testing build on GitHub Actions without cache because I felt that the build time is not much different regardless of the existence of cache.

Before submitting a pull-request to GitBucket I have first:

• read the contribution guidelines
• rebased my branch over master
• verified that project is compiling
• verified that tests are passing
• squashed my commits as appropriate (keep several commits if it is relevant to understand the PR)
• marked as closed using commit message all issue ID that this PR should correct

[magnolia-k]

I also believe that setting the GitHub Actions cache won't be dramatically faster

However, it seems to be different with respect to the originally set cache path, coursier, has that been tested?

https://get-coursier.io/docs/cache

It seems to be ~/.cache/coursier/v1, not ~/.coursier. be

[takezoe]

Oh, it needs to be updated. I will try to cache new path in another pull request. Thanks!

[takezoe]

Anyway, the performance is not much different. 😢 #2481