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by default only the main branch will write to the cache, other branches can use that information.

yeah, I get that but didn't I just tell it to by setting that flag?

just trying to test it before merging to the main branch

no, there is a separate flag to indicate which branches can write to the cache.

what's that? I saw an interpreted string for cache-read-only

See `Using the cache read-only` in the docs

I read that, it doesn't make sense, honestly this API doesn't make sense

I mean, what happens when all values are true?

what's the difference between the update and just setting read-only to false

The default is something like `github.ref != 'refs/heads/main'` - its readonly everywhere but main.  Setting it to `false` would allow any branch to update the cache, and conversely `true` would disable any cache updates.