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I like being able to use the image in later pipeline steps without having to pass a variable around. This would be tough to do with time, but it's easy to do with date since we only really run those pipeline during work hours.

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This will result in using the same tag for all builds that day - which defeats the purpose of a unique version to a large degree If you are planning on testing or deploying a specific version.

The tag also contains the commit id, not just the date.

Right - that would assume that the build does not pull in potentially different dependency [versions] even if the code itself doesn't change. This may or may not be the case.

Don't you need partial SHA anyway? This needs a variable.

And if you have a git checkout around, you can use git commit timestamp - time up to seconds and does not need anything except the source tree.

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