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What does this PR do?
Adds a new function to delete images with a given name that do not have the same tag (nor a second tag; you can tag to keep something). Uses this to look for and clean up any old builder images, so that we'll automatically clean up whenever we pull a new one.
Screenshot / video of UI
N/A
What issues does this PR fix or reference?
Fixes #98.
How to test this PR?
Pull the 'latest' bootc builder image and then build a new disk image, 'latest' will be deleted since we're using a tagged one.