feat: validate YAML gha

.github/workflows/validate-yamls.yml

@@ -0,0 +1,65 @@
+name: Validate YAML Workflows
+
+on:
+  pull_request:
+    paths:
+      - 'yaml_instance/**/*.yaml'
+      - '.github/workflows/**/*.yml'
+      - 'tools/validate_all_yamls.py'
+      - 'check/**/*.py'
+  
+  push:
+    branches:
+      - main
+    paths:
+      - 'yaml_instance/**/*.yaml'
+      - '.github/workflows/**/*.yml'
+      - 'tools/validate_all_yamls.py'
+      - 'check/**/*.py'
+  
+  workflow_dispatch:
+
+jobs:
+  validate:
+    name: Validate YAML Configuration Files
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      
+      - name: Set up Python 3.12
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+        with:
+          enable-cache: true
+      
+      - name: Cache uv dependencies
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cache/uv
+            .venv
+          key: ${{ runner.os }}-uv-${{ hashFiles('uv.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-uv-
+      
+      - name: Install dependencies
+        run: uv sync
+      
+      - name: Run YAML validation
+        run: uv run python tools/validate_all_yamls.py
+      
+      - name: Report validation results
+        if: always()
+        run: |
+          if [ $? -eq 0 ]; then
+            echo "All YAML workflow files passed validation"
+          else
+            echo "YAML validation failed - check the logs above for details"
+            exit 1
+          fi