feat: add 'newest' policy - sort tags by image build date - #856
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Add a new 'newest' policy that filters tags by regexp and sorts them
by the image creation timestamp from the registry, rather than by
lexicographic string comparison.
This solves the problem where non-semver tags (like git commit hashes)
cannot be meaningfully sorted by string value. The newest policy
fetches the image config blob from the registry to read the 'created'
timestamp, then picks the most recently built image.
Usage examples:
keel.sh/policy: "newest:^[a-f0-9]{7}$" # git short hashes
keel.sh/policy: "newest:^build-.*" # build-prefixed tags
keel.sh/policy: "newest:.*" # any tag
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The
regexppolicy sorts matching tags lexicographically, which doesn't work for non-semver tags like git commit hashes -fffdf40sorts higher thanddc5ad3even though it was built earlier.This adds a
newestpolicy that filters tags by regexp (same asregexp) but sorts by the image build date from the registry config blob instead of string comparison. For each matching tag, it fetches thecreatedtimestamp from the image config blob and picks the most recently built one. Same approach as ArgoCD Image Updater'snewest-buildstrategy.Usage: