Wave 2. The buildctl/skopeo step here was one of nineteen near-identical
copies; the implementation now lives in .gitea/build-image.sh,
byte-identical to mathias/infra's ci-templates/build-image.sh and held
there by a drift gate. Labels, tags and build-args are inputs.
Behaviour unchanged: same registry, same :sha/:latest/version tags, same
revision and source labels.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011PL5XcG68SvQqz3vGVbWbf
