Fail PR if Warnings are present in React Code (#1348)

.github/workflows/react-no-warnings.yml

@@ -0,0 +1,17 @@
+name: "React Code Has No Warnings"
+on:
+  push:
+  pull_request:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install modules
+        working-directory: ./portal-ui
+        run: yarn
+      - name: Check for Warnings in build output
+        working-directory: ./portal-ui
+        continue-on-error: false
+        run: |
+          chmod +x check-warnings.sh  && ./check-warnings.sh