Ensure git credentials are set up for signoff notes.

Author: cowboyd

.github/workflows/shipit.yml

@@ -20,6 +20,8 @@ jobs:
 
       - name:
         run: |
+          git config --global user.email "jack@frontside.com"
+          git config --global user.name "Frontside Jack"
           deno task rel:init
           deno task rel:shipit
           git push origin 'refs/notes/*:refs/notes/*'