chore: Add warning for rebase

Signed-off-by: oliver könig <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,14 +1,21 @@
+> [!IMPORTANT]  
+> The `Update branch` button must only be pressed in very rare occassions.
+> An outdated branch is never blocking the merge of a PR.
+> Please reach out to the automation team before pressing that button.
+
 # What does this PR do ?
 
 Add a one line overview of what this PR aims to accomplish.
 
 **Collection**: [Note which collection this PR will affect]
 
-# Changelog 
+# Changelog
+
 - Add specific line by line info of high level changes in this PR.
 
 # Usage
-* You can potentially add a usage example below
+
+- You can potentially add a usage example below
 
 ```python
 # Add a code snippet demonstrating how to use this 
@@ -23,25 +30,28 @@ To re-run CI remove and add the label again.
 To run CI on an untrusted fork, a NeMo user with write access must first click "Approve and run".
 
 # Before your PR is "Ready for review"
+
 **Pre checks**:
+
 - [ ] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
 - [ ] Did you write any new necessary tests?
 - [ ] Did you add or update any necessary documentation?
 - [ ] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
   - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
 
 **PR Type**:
+
 - [ ] New Feature
 - [ ] Bugfix
 - [ ] Documentation
 
 If you haven't finished some of the above items you can still open "Draft" PR.
 
-
 ## Who can review?
 
-Anyone in the community is free to review the PR once the checks have passed. 
+Anyone in the community is free to review the PR once the checks have passed.
 [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md) contains specific people who can review PRs to various areas.
 
 # Additional Information
-* Related to # (issue)
+
+- Related to # (issue)