Add jenkins jobs for Kohn release

Issue-ID: POLICY-4380
Change-Id: I86391b15b30c2d0a6b49013c431a9536caaee7ae
Signed-off-by: liamfallon <liam.fallon@est.tech>
diff --git a/jjb/policy/policy-gui.yaml b/jjb/policy/policy-gui.yaml
index 6c43884..175a79c 100644
--- a/jjb/policy/policy-gui.yaml
+++ b/jjb/policy/policy-gui.yaml
@@ -30,6 +30,8 @@
           branch: 'istanbul'
       - 'jakarta':
           branch: 'jakarta'
+      - 'kohn':
+          branch: 'kohn'
     mvn-settings: 'policy-gui-settings'
     java-version: openjdk11
     files: '**'