add body

Signed-off-by: Alexander Dahmen <[email protected]>

Author: Fyusel

.github/workflows/upgrade-provider.yaml

@@ -77,7 +77,7 @@ jobs:
         git add --all
         git commit -m "make generate_sdks"
         git push --set-upstream origin "$BRANCH_NAME"
-        gh pr create --title "Upgrade terraform-provider-stackit to $LATEST_TAG" --base main --head "$BRANCH_NAME"
+        gh pr create --title "Upgrade terraform-provider-stackit to $LATEST_TAG" --body "This PR was generated by the Pulumi upgrade CI pipeline" --base main --head "$BRANCH_NAME"