fix: checkout HEAD during release job

The previous job pushes a new commit, so the `release` job is always
behind by a single commit.

Author: jasonwalsh

.github/workflows/pipeline.yaml

@@ -24,6 +24,7 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: 16
+      - run: git checkout HEAD^
       - run: npm ci
       - env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}