feat: add automatic publishing to GitHub Package Registry (#149)

.github/workflows/publish-package.yml

@@ -0,0 +1,18 @@
+name: Publish package
+on:
+  release:
+    types: [created]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-node@v1
+      with:
+        node-version: 12
+        registry-url: https://npm.pkg.github.com
+        scope: '@platform-coop-toolkit'
+    - run: npm ci
+    - run: npm publish
+      env:
+        NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}