Switch to upstream postgres docker image for OSS tooling

Change-Id: I1d5dfd4d9985c8bc5d5cc51864b57896d95fda49
diff --git a/postgresql/client/pushkin.yml b/postgresql/client/pushkin.yml
index 12b5906..14bd649 100644
--- a/postgresql/client/pushkin.yml
+++ b/postgresql/client/pushkin.yml
@@ -18,10 +18,13 @@
               enabled: true
               encoding: 'UTF8'
               locale: 'en_US'
-              template: 'hstore_enabled'
               users:
               - name: ${_param:pushkin_db_user}
                 password: ${_param:pushkin_db_user_password}
                 host: ${_param:pushkin_db_host}
                 createdb: true
                 rights: all privileges
+              extension:
+                hstore:
+                  enabled: true
+