ci: automated pull request test coverage report

.github/workflows/coverage.yml

@@ -0,0 +1,15 @@
+name: 'coverage report'
+
+on:
+    pull_request_target:
+        branches:
+            - main
+
+jobs:
+    coverage:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v3
+            - uses: ArtiomTr/jest-coverage-report-action@v2
+              with:
+                test-script: npm test