chore: add action to cleanup github action cache

[kadel]

Description

Adding a new GitHub Action will clean up the Cache once the PR is merged.
This should make cache cleanup faster.

More info at https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#managing-caches

Which issue(s) does this PR fix

• Fixes #?

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

[changeset-bot]

⚠️ No Changeset found

Latest commit: d09970d

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[schultzp2020]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: schultzp2020

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[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-976!

[kadel]

/override "Showcase tests on OCP/PR Test"

[openshift-ci]

@kadel: Overrode contexts on behalf of kadel: Showcase tests on OCP/PR Test

In response to this:

/override "Showcase tests on OCP/PR Test"

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