Remove justification field.

Author: scamille

.github/workflows/nightly.yml

@@ -5,9 +5,6 @@ on:
     - cron: '0 0 * * *' # run at 0 AM UTC
   workflow_dispatch:
     inputs:
-      justification:
-        description: "Reason for manual run"
-        required: true
       dryRun:
         description: "If true, do not upload files"
         default: true