Use .yaml instead of .yml

This is the recommended file extension: https://yaml.org/faq.html

.github/workflows/codecov-test-suites.yaml

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+# This workflow runs the automated test and uploads the coverage results to codecov.io
+# For more information see: https://github.com/codecov/codecov-action
+
+name: "Run Codecov Tests"
+
+on:
+  push:
+    branches: [master, develop]
+  pull_request:
+    branches: [master, develop]
+
+permissions:
+  contents: read
+
+jobs:
+  run-and-upload-coverage-report:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Install dependencies and run coverage
+        run: |
+          Xvfb :99 -screen 0 1024x768x16 &
+          export DISPLAY=:99
+          npm ci
+          touch css/custom.css
+          npm run test:coverage
+      - name: Upload coverage results to codecov
+        uses: codecov/codecov-action@v2
+        with:
+          files: ./coverage/lcov.info
+          fail_ci_if_error: true