CI: Add lint job.

Author: PotcFdk

.github/workflows/check.yml

@@ -0,0 +1,11 @@
+name: check
+on: push
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install modules
+      run: npm ci
+    - name: Run ESLint
+      run: npx eslint

package.json

@@ -2,6 +2,7 @@
   "name": "steamdiscoveryqueueautoskipper",
   "version": "0.0.0",
   "description": "https://github.com/PotcFdk/SteamDiscoveryQueueAutoSkipper",
+  "type": "module",
   "private": true,
   "dependencies": {},
   "devDependencies": {