Fix cypress action

.github/workflows/main.yml

@@ -1,12 +1,13 @@
-name: End-to-end tests
+name: Cypress Tests
 on: [push]
 jobs:
   cypress-run:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Cypress run
         uses: cypress-io/github-action@v4
         with:
+          build: npm run build
           start: npm start