add Cypress starter workflow

ci/cypress.yml

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+name: Cypress
+
+on: [push]
+
+env:
+  CI: 1 # minimal progress output
+  TERM: xterm # good terminal rendering
+
+jobs:
+  e2e:
+    name: Cypress tests
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Cache NPM modules
+      uses: actions/cache@v1
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-npm-
+    - name: Cache Cypress binary
+      uses: actions/cache@v1
+      with:
+        path: ~/.cache/Cypress
+        key: ${{ runner.os }}-cypress-${{ hashFiles('**/package.json') }}
+        restore-keys: |
+          ${{ runner.os }}-cypress-
+    - name: install Cypress
+      run: |
+        npm ci
+        npx cypress verify
+    - name: E2E tests
+      run: npx cypress run
+    # save any error screenshots as test artifacts
+    - uses: actions/upload-artifact@v1
+      if: failure()
+      with:
+        name: screenshots
+        path: cypress/screenshots
+    # video should always be generated
+    - uses: actions/upload-artifact@v1
+      with:
+        name: videos
+        path: cypress/videos

ci/properties/cypress.properties.json

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+{
+  "name": "Cypress",
+  "description": "Run end-to-end web application tests using Cypress.io",
+  "iconName": "cypress",
+  "categories": ["Testing", "Cypress"]
+}