Overlay Dockerfile from main on backfill runs#53
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Pre-existing tags (v1.1.0 .. v1.13.5) were created before the Dockerfile landed on main, so checking them out gives no Dockerfile and the build fails. On workflow_dispatch runs, fetch main and check out the current Dockerfile + .dockerignore over the tag's source tree. Push-triggered runs are unaffected -- they get the Dockerfile from the tag itself.
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Fixes the backfill path that failed in run 25728709517 with `open Dockerfile: no such file or directory`.
Old tags (v1.1.0 .. v1.13.5) predate the Dockerfile, so on `workflow_dispatch` we now fetch `main` and overlay the current `Dockerfile` + `.dockerignore` on top of the tag's source tree before building.
Push-triggered runs (future `v*` tags) are unaffected — they already contain the Dockerfile.
Note: PR validation cannot exercise the dispatch path (only push/PR triggers run on PR), so the test is to merge and re-dispatch v1.13.5.
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