fix: remove redundant lint job from build workflow and ensure main branch is specified for push events

.github/workflows/build.yml

@@ -2,6 +2,7 @@ name: Build validation
 
 on:
   push:
+    branches: [main]
   pull_request:
 
 jobs:
@@ -22,17 +23,3 @@ jobs:
     - name: Install dependencies
       run: npm i
     - run: npm run build
-
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-    - name: Use Node.js 22
-      uses: actions/setup-node@v4
-      with:
-        node-version: 22
-        cache: 'npm'
-    - name: Install dependencies
-      run: npm i
-    # Lint currently reporting lots of preexisting issues
-    # - run: npm run lint