'cleanup caches' example workflow is wrong and harmful!

[andreasabel]

It will delete the caches of the base branch, not the PR branch. Needs fixing! I added an alert in comments that this example doesn't work.

Evidence here: https://github.com/agda/agda/actions/runs/4025940394/jobs/6919801891#step:3:5
(Note: these logs will be removed by github after some time.)

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Source	Preview	Production	What Changed
actions/using-workflows/caching-dependencies-to-speed-up-workflows.md	fpt ghec ghes@ 3.7 3.6 3.5	fpt ghec ghes@ 3.7 3.6 3.5

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ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

@andreasabel Thanks so much for opening a PR! I'll get this triaged for review ⚡

[cmwilson21]

@andreasabel Actually after looking at it, this PR would be better opened as issue as this is a report of a discrepancy. So I'm going to go ahead and close this PR. 💛

Would you mind taking the information in your note and creating a new issue with it? Then I can get this properly triaged and up for review 👍

[andreasabel]

@cmwilson21 : Ok, Courtney, I opened an issue instead:

• 'cleanup caches' example workflow is wrong and harmful! #23600

(This is my first report here, so I don't know my ways around here yet. Initially, I followed the "Contribute" button in the docs which brought me to the editor to open a PR.)

[cmwilson21]

@andreasabel Sounds great! Take a look at the contributing.md if you want to explore further for future contributions 😄