bvandeusen
dee93faa37
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Additive and inert. Every build now stamps `fc.revision` as an image label, and a diagnostic step tries to read it back off the channel tag. Nothing downstream reads either yet — the reuse check still keys on the r-<rev> tag. The question step 3 has to answer before committing: can the reuse check be keyed on a LABEL read off the channel tag instead of on a separate tag? If it can, nothing is minted per build, the -main/-dev identity split disappears with CHANNELLED, and #3154's base-refresh clobber stops existing rather than needing a workaround. It also closes a defect found in what already shipped: r-<rev> tags do not match the registry's keep_pattern (#3157), so they are prunable, and a pruned identity tag silently costs a rebuild. A label cannot be pruned — it rides inside a tag that must exist. Three probes rather than one, because `--format` templating over .Image varies by buildx version and one round trip per guess is a poor trade. Two questions, answered at different times, and conflating them would abandon a working design: 1. Do the template mechanics work here? Answered on the first run — if the probes print a labels map, even an empty one, `--format` resolves on this buildx and this registry. That is the real gate. 2. Does a value round-trip? Only once an artifact genuinely rebuilds. This push touches build.yml, which is in no path set, so all three artifacts reuse and stamp nothing. Expect no values this run. That second point is the migration path rather than a defect: under the real mechanism "no label" reads as a MISS, so each artifact rebuilds once and is stamped from then on — one extra build per artifact, ever, in the safe direction. `imagetools create` cannot backfill it, since it copies a manifest and config labels are not manifest annotations.