Run linting on PR. (#1144)

.github/workflows/dev.yaml

@@ -11,6 +11,26 @@ env:
   ALLOY_ENV: int
 
 jobs:
+  linting:
+    name: "Linting files"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Node.js version
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
+        id: npm-cache
+        with:
+          path: "**/node_modules"
+          key: ${{ runner.os }}-modules-${{ hashFiles('**/package-lock.json') }}-${{ secrets.NPM_CACHE_VERSION }} # increment NPM_CACHE_VERSION secret to force cache reset
+      - name: Install dependencies
+        if: steps.npm-cache.outputs.cache-hit != 'true'
+        run: npm ci
+      - name: Linting
+        run: npm run lint
+
   unit-test:
     name: "Unit Test"
     runs-on: ubuntu-latest