Add yamlfmt precommit hook (#2584)

Co-authored-by: Shuchang Zheng <wintonzheng0325@gmail.com>

.github/workflows/n8n-ci.yml

@@ -1,37 +1,30 @@
 name: Run n8n package CI
-
 on:
   push:
-    branches: [ main ]
+    branches: [main]
     paths:
       - 'integrations/n8n/**'
   pull_request:
-    branches: [ main ]
+    branches: [main]
     paths:
       - 'integrations/n8n/**'
-
 jobs:
   test:
     runs-on: ubuntu-latest
-    
     steps:
-    - uses: actions/checkout@v4
-    
-    - name: Set up Node.js
-      uses: actions/setup-node@v4
-      with:
-        node-version-file: .nvmrc
-
-    - name: Install pnpm
-      uses: pnpm/action-setup@v2
-      with:
-        version: 9
-        run_install: false
-        
-    - name: Install dependencies
-      working-directory: integrations/n8n
-      run: pnpm install --frozen-lockfile
-        
-    - name: Build and Lint
-      working-directory: integrations/n8n
-      run: pnpm prepublishOnly
+      - uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 9
+          run_install: false
+      - name: Install dependencies
+        working-directory: integrations/n8n
+        run: pnpm install --frozen-lockfile
+      - name: Build and Lint
+        working-directory: integrations/n8n
+        run: pnpm prepublishOnly