Add signoff option to promotion workflow

Signed-off-by: Nick Burgan <13688219+nmburgan@users.noreply.github.com>

Author: nmburgan

.github/workflows/promote.yml

@@ -96,6 +96,7 @@ jobs:
           assignees: '${{ github.triggering_actor }}'
           author: '${{ env.GIT_AUTHOR_NAME }} <${{ env.GIT_AUTHOR_EMAIL }}>'
           committer: '${{ env.GIT_COMMITTER_NAME }} <${{ env.GIT_COMMITTER_EMAIL }}>'
+          signoff: true
           base: ${{ inputs.branch }}
           body: |
-            Automated promotion of ${{ inputs.component }} to ref ${{ inputs.ref }}.
+            Automated promotion of ${{ inputs.component }} to ref ${{ inputs.ref }}.