Added a coverage GHA

Author: azmeuk

.github/workflows/coverage.yml

@@ -0,0 +1,13 @@
+---
+name: "coverage"
+on:
+  pull_request:
+jobs:
+  coverage:
+    permissions:
+      checks: write
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ArtiomTr/jest-coverage-report-action@v2

.gitignore

@@ -3,3 +3,4 @@ node_modules
 public/bundle.*
 index.js
 index.mjs
+coverage

package.json

@@ -40,7 +40,7 @@
     "dev": "run-p start:dev autobuild",
     "start": "sirv public --single",
     "start:dev": "sirv public --single --dev",
-    "test": "jest",
+    "test": "jest --coverage",
     "prettier": "prettier --write public src",
     "prepare": "npm run build"
   },