ci: require release workflow to run on tags (#12613)

The Release workflow allowed workflow_dispatch from branch refs but only built `@pnpm/exe` artifacts on tag refs. A branch dispatch on main after the 11.9.0 release bump selected the platform artifact packages in the internal publish step, then failed in their prepublishOnly binary verification because the binaries had not been built.

Add a preflight job that accepts only refs/tags/v*.*.*. The real release job depends on that preflight, so non-tag dispatches fail before entering the protected release environment or configuring npm auth.

With non-tag refs rejected up front, the release job can run the full tag release path without per-step tag guards.

.github/workflows/release.yml

@@ -4,15 +4,28 @@ on:
   push:
     tags:
       - "v*.*.*"
-  # Manual trigger for publishing whatever versions are currently in each
-  # package.json on the selected ref (typically `main`). Useful after a
-  # version-bump commit that hasn't been tagged yet. Versions already on
-  # npm are rejected by the registry, so re-running on an already-released
-  # tree is a no-op rather than a corruption.
+  # Manual trigger for rerunning a tag release. Dispatching this workflow from a
+  # branch fails before publishing because release artifacts are only built on
+  # version tags.
   workflow_dispatch:
 
 jobs:
+  validate-release-ref:
+    runs-on: ubuntu-latest
+    permissions: {}
+    steps:
+      - name: Validate release ref
+        run: |
+          case "${GITHUB_REF}" in
+            refs/tags/v*.*.*) ;;
+            *)
+              echo "::error::The release workflow must run from a version tag like v11.9.0. Current ref: ${GITHUB_REF}"
+              exit 1
+              ;;
+          esac
+
   release:
+    needs: validate-release-ref
     permissions:
       id-token: write  # Required for OIDC
       contents: write  # for softprops/action-gh-release to create GitHub release
@@ -47,11 +60,6 @@ jobs:
         # No NPM_TOKEN: pnpm has no static token to short-circuit on, so it will perform
         # the OIDC token exchange against npm's trusted-publishing config for `@pnpm/exe`.
         # The exe artifacts must be built before the publish, so they're built here too.
-        #
-        # On workflow_dispatch (tagless manual run), skip this step: building the exe
-        # artifacts takes ~minutes, and the CLI + exe are normally released together
-        # via a `v*.*.*` tag. Manual dispatch is for lib-only republishes.
-        if: startsWith(github.ref, 'refs/tags/')
         run: |
           pn --filter=@pnpm/exe run build-artifacts
           pn --filter=@pnpm/exe publish --tag=next-11 --access=public --provenance
@@ -65,51 +73,22 @@ jobs:
           # doesn't work — pnpm doesn't appear to pass auth tokens to child processes.
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
         run: |
+          trap 'pn config delete "//registry.npmjs.org/:_authToken" || true' EXIT
           pn config set "//registry.npmjs.org/:_authToken" "${NPM_TOKEN}"
-          publish_filters=(
-            "--filter=!pnpm"
-            "--filter=!@pnpm/exe"
-          )
-          if [[ "${GITHUB_REF}" != refs/tags/* ]]; then
-            publish_filters+=(
-              "--filter=!@pnpm/macos-arm64"
-              "--filter=!@pnpm/linux-arm64"
-              "--filter=!@pnpm/linux-x64"
-              "--filter=!@pnpm/linuxstatic-arm64"
-              "--filter=!@pnpm/linuxstatic-x64"
-              "--filter=!@pnpm/win-arm64"
-              "--filter=!@pnpm/win-x64"
-            )
-          fi
-          pn publish "${publish_filters[@]}" --access=public --provenance
-          pn config delete "//registry.npmjs.org/:_authToken"
+          pn publish --filter=!pnpm --filter=!@pnpm/exe --access=public --provenance
       - name: Publish pnpm CLI (trusted publishing)
         # No NPM_TOKEN — same rationale as the @pnpm/exe step above. This must come after
         # the previous step has cleared its NPM_TOKEN from pnpm's config.
-        #
-        # On workflow_dispatch (tagless manual run), skip — see the @pnpm/exe step.
-        if: startsWith(github.ref, 'refs/tags/')
         run: pn publish --filter=pnpm --tag=next-11 --access=public --provenance
-      # The remaining steps build the GitHub Release (asset upload, body,
-      # attestation of the dist/* exe files). Skip them on workflow_dispatch:
-      # there's no version tag to attach the release to, so
-      # softprops/action-gh-release would default `tag_name` to `github.ref_name`
-      # (which is `main` for a manual dispatch from main) and produce a junk
-      # release. The npm publishes above are unaffected — they're the
-      # authoritative artifact path on manual runs.
       - name: Copy Artifacts
-        if: startsWith(github.ref, 'refs/tags/')
         run: pn copy-artifacts
       - name: Attest build provenance
-        if: startsWith(github.ref, 'refs/tags/')
         uses: actions/attest-build-provenance@a2bbfa25375fe432b6a289bc6b6cd05ecd0c4c32 # v4.1.0
         with:
           subject-path: 'dist/*'
       - name: Generate release description
-        if: startsWith(github.ref, 'refs/tags/')
         run: pn make-release-description
       - name: Release
-        if: startsWith(github.ref, 'refs/tags/')
         # `gh release create` could replace this, but the release pipeline is
         # sensitive and softprops/action-gh-release is widely battle-tested.
         uses: softprops/action-gh-release@b4309332981a82ec1c5618f44dd2e27cc8bfbfda # v3.0.0 # zizmor: ignore[superfluous-actions]