update pipeline

pipelines/docbot

@@ -12,6 +12,16 @@ pipeline {
             set -euo pipefail
             cd ~/docbot || exit 1
             git diff --name-only origin/main main | grep -i 'alembic/versions' > db_script.txt || true
+
+            if [ "$(git rev-parse --abbrev-ref HEAD)" != "main" ]; then
+              git checkout main
+            fi
+
+            if git pull origin main | grep -q "Already up to date."; then
+              echo "No updates to deploy."
+              exit 0
+            fi
+
             git pull origin main
             . .venv/bin/activate
             if [ -s db_script.txt ]; then