ci(nix): trigger vendorHash workflow via workflow_run#192
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The `push` trigger from PR #191 doesn't escape Dependabot's secret restrictions — GitHub applies the read-only / no-secrets policy to any event triggered directly by Dependabot, including `push`. That's why run 29481599947 on PR #188 failed with the same "Input required and not supplied: token" as before the workflow rewrite. Switch to `workflow_run` off the `Nix` build workflow. `workflow_run` runs start from the base repo on the default branch and are not classified as Dependabot-triggered, so Actions secrets (including the push-back PAT) resolve. The workflow now fires only when the `Nix` build failed on a non-main same-repo branch. `workflow_dispatch` remains for manual re-runs and takes an explicit `branch` input.
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Summary
Switch the Nix vendorHash workflow from
pushtoworkflow_run, chained off theNixbuild workflow.Why
Run 29481599947 on PR #188 failed with the same
Input required and not supplied: tokenerror we thought PR #191 fixed. The GitHub docs make it explicit: any event triggered directly by Dependabot —pull_request,pull_request_target,push, etc. — gets a read-onlyGITHUB_TOKENand no access to Actions secrets.pushdid not escape that.workflow_rundoes. It fires after another workflow completes, and the follow-up run starts from the base repo on the default branch. It's not classified as Dependabot-triggered, so Actions secrets (includingREPOSITORY_FULL_ACCESS_GITHUB_TOKEN) resolve.How it works
go.mod/go.sum.Nixbuild workflow (nix.yml) runs on the PR, fails becausevendorHashis stale.workflow_runfires this workflow; job guard confirms failure + non-main + same-repo.nix/update-vendor-hash.sh, pushes the fix as a follow-up commit.Nix, which either goes green (hash was fixed) or triggers this workflow again (converges on a no-op).