Chore: Faster Docker image cleanup

[stumpylog]

Proposed change

Alright, I got fed up with the cleaning taking nearly an hour, all of that due to the confirmation step I added.

Now, instead of pulling every tag for every image, the tool uses inspection to confirm the index for a tag can be found and the digests the index points to (the actual image data with layers) can also be found and inspected. The assumption being, if something were deleted inadvertently, it will no longer be inspectable, because it's gone.

It helps to know that indexes have a list of descriptors where the digest field points to the actual image manifest. This change simple follows the linkage to the end, but without downloading the image layers.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain)

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[shamoon]

Awesome thanks, yes I agree these have been a little annoying. It kinda feels like GH should be handling this with some kind retention policy or whatever but appreciate the solution. Approving based on looking through the action log, I don't have much to add code-wise

[github-actions]

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