fast-forward reads an input it never declares #22

fast-forward.yml declares environment, source-ref and target-ref. Line 36 passes repository: ${{ inputs.repository }} to actions/checkout.

The expression resolves to an empty string, and checkout falls back to the repository running the workflow. That happens to be what every caller wants, so the step works by accident.

Reproduce: actionlint -shellcheck= .github/workflows/fast-forward.yml

fast-forward.yml:36:27: property "repository" is not defined in object type
{environment: string; source-ref: string; target-ref: string} [expression]

Fix: drop the line, or declare a repository input and default it to ${{ github.repository }}.

Found while reviewing #20. Reported by actionlint, which #21 proposes adding to CI.