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How to enable tag immutability in quay.io?

At first glance, it seems that tag immutability is not a feature provided by Quay. You can enable "Trust and Signing" in the "settings" of the repo: Please note that this will not ...
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What docker command could be issued to check whether a certain local docker image resides in a docker registry?

A related Q&A was already created on StackOverflow back in the day. Several answers simply do a docker pull image-to-be-checked. If exit 0, the image exists in a certain registry. If not then the ...
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