Move cypress to GitHub actions

Author: nick-keller

.github/workflows/tests.yml

@@ -21,4 +21,10 @@ jobs:
         uses: coverallsapp/github-action@1.1.3
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
-
+  cypress:
+    name: End-to-End tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Cypress run
+        uses: cypress-io/github-action@v2