Add auto-sync with celestia CI workflow

.github/workflows/celestia-sync.yml

@@ -0,0 +1,78 @@
+name: Open PR to sync
+
+on:
+  pull_request:
+    branches:
+      - integration
+    types:
+      - closed
+  workflow_dispatch:
+
+jobs:
+  cherry-pick-and-create-pr:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Set up Git
+      run: |
+        git config user.name "github-actions[bot]"
+        git config user.email "github-actions[bot]@users.noreply.github.com"
+
+    - name: Fetch all branches
+      run: git fetch --all
+
+    - name: Ensure integration branch exists
+      run: |
+        if ! git show-ref --verify --quiet refs/remotes/origin/integration; then
+          echo "Integration branch not found. Exiting.";
+          exit 1;
+        fi
+
+    - name: Create new branch from integration
+      run: |
+        NEW_BRANCH="bot/celestia-sync"
+        git checkout -b $NEW_BRANCH origin/integration
+        echo "NEW_BRANCH=$NEW_BRANCH" >> $GITHUB_ENV
+
+    - name: Push new branch to origin
+      run: |
+        git push --force origin $NEW_BRANCH
+
+    - name: Check for existing PR to celestia-integration
+      id: check-pr
+      uses: actions/github-script@v6
+      with:
+        script: |
+          const { data: pulls } = await github.pulls.list({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            base: 'celestia-integration',
+            head: `${context.repo.owner}:${process.env.NEW_BRANCH}`,
+          });
+          if (pulls.length > 0) {
+            core.setOutput('pr_exists', 'true');
+            core.setOutput('pr_url', pulls[0].html_url);
+          } else {
+            core.setOutput('pr_exists', 'false');
+          }
+
+    - name: Create Pull Request to celestia-integration
+      if: steps.check-pr.outputs.pr_exists == 'false'
+      uses: peter-evans/create-pull-request@v5
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        branch: ${{ env.NEW_BRANCH }}
+        base: celestia-integration
+        title: "Cherry-pick commits from integration"
+        body: |
+          This PR cherry-picks all commits from the integration branch into the celestia-integration branch.
+
+    - name: Log existing PR
+      if: steps.check-pr.outputs.pr_exists == 'true'
+      run: |
+        echo "A PR already exists: ${{ steps.check-pr.outputs.pr_url }}. No new PR will be created."