mock building of react assets

.github/workflows/test.yml

@@ -25,7 +25,14 @@ jobs:
           sudo mv /tmp/go /usr/local/go
           cd -
           ls -l /usr/bin/go
+
       - name: Checkout Repo
         uses: actions/checkout@v2
+
+      # This file would normally be created by `make assets`, here we just
+      #  mock it because the file is required for the tests to pass.
+      - name: Mock building of necessary react file
+        run: mkdir web/ui/static/react && touch web/ui/static/react/index.html
+
       - name: Run Tests
         run: GO=/usr/local/go/bin/go make common-test