Add git signoff to the commit in the upmerge workflow

[brooke-hamilton]

Thank you for helping make the Radius documentation better!

Please follow this checklist before submitting:

• Read the contribution guide
• Commands include options for Linux, MacOS, and Windows within codetabs
• New file and folder names are globally unique
• Page references use shortcodes instead of markdown or URL links
• Images use HTML style and have alternative text
• Places where multiple code/command options are given have codetabs

In addition, please fill out the following to help reviewers understand this pull request:

Description

This pull request includes a change to the .github/workflows/upmerge.yaml file. The change ensures that commits are signed off when performing an upmerge to the edge branch.

• .github/workflows/upmerge.yaml: Modified the git commit command to include the --signoff flag, ensuring that commits are signed off during the upmerge process.

Git log entries for the commit will now look like this, which satisfies the DCO requirement:

Author: Radius CI Bot <[email protected]>
Date:   Wed Nov 27 14:52:43 2024 +0000

    Upmerge to edge
    
    Signed-off-by: Radius CI Bot <[email protected]>

Issue reference

Fixes: #1270

[lakshmimsft]

confirming: this is meant to be merged into v0.40 branch, right? and not edge?

[brooke-hamilton]

confirming: this is meant to be merged into v0.40 branch, right? and not edge?

Yes - the workflow is run from the default branch, which is currently v0.40. All changes, including this one, will be merged to the edge branch when the workflow is run.