init setup of publish workflow

Author: mattfors

.github/workflows/build.yml

@@ -28,7 +28,7 @@ jobs:
       run: npm run build
 
     - name: Authenticate to GitHub Packages registry
-      run: echo "//npm.pkg.github.com/:_authToken=${{ secrets.GITHUB_TOKEN }}" > ~/.npmrc
+      run: echo "//npm.pkg.github.com/:_authToken=${{ secrets.NPM_TOKEN }}" > ~/.npmrc
 
     - name: Publish to GitHub Packages
       env: