Add permissions back to cherry-pick workflow

I messed up and thought they were inherit from the workflow called,
they are not.. so adding them back.

Signed-off-by: Vincent Demeester <vdemeest@redhat.com>

Author: vdemeester

.github/workflows/cherry-pick-command.yaml

@@ -19,6 +19,11 @@ on:
   repository_dispatch:
     types: [cherry-pick-command]
 
+permissions:
+  contents: write
+  pull-requests: write
+  issues: write
+
 jobs:
   cherry-pick:
     name: Cherry Pick Actions