Add GitHub Actions workflow for testing and coverage, update package.json scripts with coverage command

Author: andrey-helldar

.github/workflows/tests.yml

@@ -0,0 +1,26 @@
+name: Tests
+
+on:
+    push:
+
+jobs:
+    test:
+        runs-on: ubuntu-latest
+        steps:
+            -   uses: actions/checkout@v6
+
+            -   name: Use Node.js lts/*
+                uses: actions/setup-node@v6
+                with:
+                    node-version: lts/*
+                    check-latest: true
+
+            -   run: npm ci
+            -   run: npm run type-check
+            -   run: npm run coverage
+
+            -   uses: coverallsapp/github-action@master
+                with:
+                    github-token: ${{ secrets.GITHUB_TOKEN }}
+
+            -   run: npm run build

package.json

@@ -4,11 +4,12 @@
     "author": "Andrey Helldar <helldar@dragon-code.pro>",
     "main": "./dist/index.js",
     "scripts": {
-        "type-check": "tsc --noEmit",
-        "test": "jest",
-        "dev": "npm run build && node dist/index.js",
         "build": "ncc build ./src/index.ts",
-        "release": "npm run build"
+        "release": "npm run build",
+        "dev": "npm run build && node dist/index.js",
+        "coverage": "jest --coverage",
+        "test": "jest",
+        "type-check": "tsc --noEmit"
     },
     "keywords": [
         "preview",