Pin Node version temporarily to v12

Author: notlmn

.github/workflows/deployment.yml

@@ -20,6 +20,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: 12
     - run: npm install
     - run: npm test # This includes the build
     - uses: fregante/daily-version-action@v1