Add NPM_TOKEN to publish alpha step

Author: andrewbranch

.github/workflows/main.yml

@@ -71,4 +71,6 @@ jobs:
       run: |
         version=`node .github/workflows/getVersion.js 2.0.0`
         npm --no-git-tag-version version $version
-        npm publish --tag alpha
+        npm publish --tag alpha
+      env:
+        NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}