fix(ci): make netsim work on forks (#2757)

## Description

Simply skips the troublesome step if it's not configured properly (due
to missing org secrets).

## Breaking Changes

<!-- Optional, if there are any breaking changes document them,
including how to migrate older code. -->

## Notes & open questions

<!-- Any notes, remarks or open questions you have to make about the PR.
-->

## Change checklist

- [ ] Self-review.
- [ ] Documentation updates following the [style
guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text),
if relevant.
- [ ] Tests if relevant.
- [ ] All breaking changes documented.

.github/workflows/netsim_runner.yaml

@@ -158,7 +158,7 @@ jobs:
         python3 reports_csv.py --metro --commit ${{ env.LAST_COMMIT_SHA }} > report_metro.txt
         python3 reports_csv.py --metro --integration --commit ${{ env.LAST_COMMIT_SHA }} > report_metro_integration.txt
     
-    - name: Dump report
+    - name: Upload report
       run: |
         export AWS_ACCESS_KEY_ID=${{secrets.S3_ACCESS_KEY_ID}}
         export AWS_SECRET_ACCESS_KEY=${{secrets.S3_ACCESS_KEY}}
@@ -172,7 +172,9 @@ jobs:
 
         aws_fname=${{ env.LAST_COMMIT_SHA }}.tar.gz
         tar -cvzf report.tar.gz report_prom.txt report_table.txt report_metro.txt report_metro_integration.txt logs/ report/ viz/
-        aws s3 cp ./report.tar.gz s3://${{secrets.S3_REPORT_BUCKET}}/$aws_fname --no-progress
+        if [[ -n "${{ secrets.S3_BUCKET }}" ]]; then
+          aws s3 cp ./report.tar.gz s3://${{secrets.S3_REPORT_BUCKET}}/$aws_fname --no-progress
+        fi        
 
     - name: Move report
       run: |