chore: add DCO to release please

Signed-off-by: Todd Baert <[email protected]>

Author: toddbaert

.github/workflows/release.yml

@@ -25,6 +25,7 @@ jobs:
         with:
           token: ${{secrets.RELEASE_PLEASE_ACTION_TOKEN}}
           target-branch: main
+          signoff: "OpenFeature Bot <[email protected]>"
 
       # These steps are only run if this was a merged release-please PR
       - name: checkout