add github action

.github/workflows/build-docs.yml

@@ -0,0 +1,28 @@
+name: 'build-docs'
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+  workflow_dispatch:
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build-docs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger mintlify workflow
+        if: github.event_name == 'push'
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ secrets.DOCS_CHILDREN_ACTIONS_TRIGGER_TOKEN }}
+          script: |
+            await github.rest.actions.createWorkflowDispatch({
+              owner: 'mintlify-onboarding',
+              repo: 'skip',
+              workflow_id: 'mintlify-action.yml',
+              ref: 'main',
+            });