ci: cache docker images on main and use in PR builds #34841
Merged
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Reason for this change
We try to avoid making requests to any repos by caching the used image as much as possible.
We do this on builds on main as a baseline and restore the cache on PRs. This assumes that most PRs won't add new images and adding new images is rare enough.
Description of changes
Add a cache for docker images.
Describe any new or updated permissions being added
None.
Description of how you validated changes
Run the commands manually.
Checklist
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license