Add missing sigil before salt_master_environment_repository
diff --git a/salt/master/formula/git/ccp.yml b/salt/master/formula/git/ccp.yml
index b124870..c8f1c65 100644
--- a/salt/master/formula/git/ccp.yml
+++ b/salt/master/formula/git/ccp.yml
@@ -6,5 +6,5 @@
           formula:
             ccp:
               source: git
-              address: '{_param:salt_master_environment_repository}/salt-formula-ccp.git'
+              address: '${_param:salt_master_environment_repository}/salt-formula-ccp.git'
               revision: ${_param:salt_master_environment_revision}