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-api.yaml b/jjb/policy/policy-api.yaml
index cf81426..49ca4c6 100644
--- a/jjb/policy/policy-api.yaml
+++ b/jjb/policy/policy-api.yaml
@@ -32,6 +32,8 @@
           branch: 'istanbul'
       - 'jakarta':
           branch: 'jakarta'
+      - 'kohn':
+          branch: 'kohn'
     mvn-settings: 'policy-api-settings'
     java-version: openjdk11
     files: '**'