ci: add the "Release" GitHub Actions workflow

.github/workflows/release.yml

@@ -0,0 +1,27 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  main:
+    name: Test and Release
+    runs-on: ubuntu-latest
+    env:
+      NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+      GITHUB_TOKEN: ${{ secrets.KARMARUNNERBOT_GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          token: ${{ env.GITHUB_TOKEN }}
+          fetch-depth: 0
+      - uses: browser-actions/setup-firefox@latest
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 12
+          cache: npm
+      - run: npm ci
+      - run: npm run test
+      - run: npm run release

package.json

@@ -7,7 +7,8 @@
     "lib/*.js"
   ],
   "scripts": {
-    "test": "jasmine && grunt"
+    "test": "jasmine && grunt",
+    "release": "grunt release"
   },
   "repository": {
     "type": "git",
@@ -98,4 +99,4 @@
     "Matthew Hill <[email protected]>",
     "Milan Lempera <[email protected]>"
   ]
-}
+}