chore - CI check migrations are in sync and warn (#10946)

.github/workflows/enterprise-check-migrations.yml

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+name: Enterprise Check Migrations
+
+on:
+  pull_request:
+    paths:
+      - 'enterprise/migrations/**'
+
+jobs:
+  check-sync:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout PR branch
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: 0
+
+
+      - name: Fetch base branch
+        run: git fetch origin ${{ github.event.pull_request.base.ref }}
+
+      - name: Check if base branch is ancestor of PR
+        id: check_up_to_date
+        shell: bash
+        run: |
+          BASE="origin/${{ github.event.pull_request.base.ref }}"
+          HEAD="${{ github.event.pull_request.head.sha }}"
+          if git merge-base --is-ancestor "$BASE" "$HEAD"; then
+            echo "We're up to date with base $BASE"
+            exit 0
+          else
+            echo "NOT up to date with base $BASE"
+            exit 1
+          fi
+
+      - name: Find Comment
+        uses: peter-evans/find-comment@v3
+        id: find-comment
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: 'github-actions[bot]'
+          body-includes: |
+            ⚠️ This PR contains **migrations**
+
+      - name: Comment warning on PR
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-id: ${{ steps.find-comment.outputs.comment-id }}
+          edit-mode: replace
+          body: |
+            ⚠️ This PR contains **migrations**. Please synchronize before merging to prevent conflicts.

enterprise/migrations/README.md

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+# Enterprise Migrations
+
+## Migration conflicts
+
+OpenHands PRs can fall out of sync with `main` quickly. When adding a migration, it's safest to sync the PR with main before merging to ensure you are caught up to any others that have been added.