Make user min_pool_size configurable

Author: Speissi

charts/pgcat/templates/secret.yaml

@@ -61,7 +61,7 @@ stringData:
     password = {{ $user.password | quote }}
     pool_size = {{ $user.pool_size }}
     statement_timeout = {{ $user.statement_timeout }}
-    min_pool_size = 3
+    min_pool_size = {{ or $user.min_pool_size 3}}
     server_lifetime = 60000
     {{-     if and $user.server_username $user.server_password }}
     server_username = {{ $user.server_username | quote }}