ci: run cypress tests on push

.github/workflows/cypress.yml

@@ -0,0 +1,37 @@
+name: cypress tests
+on: [push]
+jobs:
+  cypress-run:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+
+      - name: set up node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+          cache: 'yarn'
+
+      - name: install yarn
+        # avoid checksum errors with github packages
+        run: yarn
+
+      - name: cypress run
+        uses: cypress-io/github-action@v2
+        env:
+          REACT_APP_API_HOST: ${{ secrets.REACT_APP_API_HOST }}
+          REACT_APP_GRAASP_COMPOSE_HOST: http://localhost:3000
+          REACT_APP_NODE_ENV: test
+        with:
+          install: false
+          config: baseUrl=http://localhost:3000
+          start: yarn start:ci
+          wait-on: 'http://localhost:3000'
+          wait-on-timeout: 180
+          browser: chrome
+          headless: true
+          quiet: true
+
+      - name: coverage report
+        run: npx nyc report --reporter=text-summary