Update release workflow

.github/workflows/release.yml

@@ -5,8 +5,11 @@ on:
   push:
     branches: [main]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 jobs:
-  build:
+  release:
     runs-on: ubuntu-latest
 
     # This environment contains secrets needed for publishing
@@ -22,6 +25,26 @@ jobs:
           # Don't save creds in the git config (so it's easier to override later)
           persist-credentials: false
 
+      # This repo is inactive, so the tokens for publishing have been removed.
+      # To release, you must generate fine-grained npm and GitHub tokens (with write access for ONLY
+      # this repo and npm package/scope) and save them as secrets under Settings => Environments => release.
+      - name: Check tokens
+        uses: actions/github-script@v7
+        env:
+          NPM_AUTHTOKEN: ${{ secrets.NPM_AUTHTOKEN }}
+          REPO_PAT: ${{ secrets.REPO_PAT }}
+        with:
+          script: |
+            const fs = require('fs');
+            if (!process.env.NPM_AUTHTOKEN || !process.env.REPO_PAT) {
+              const releaseMessage = 'Secrets required for release are missing. See release.yml for instructions.';
+              if (fs.existsSync('change')) {
+                core.setFailed(releaseMessage);
+              } else {
+                core.warning(releaseMessage);
+              }
+            }
+
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with: