Allow for custom certificate file paths.

[Roiki11]

trafficstars

Currently patroni and Postgresql configuration use hardcoded paths for tls certificates. It would be more convenient if these were exposed as variables for use with custom certificates and certificate automation. Further the ca_file path for both instances is not mandatory if the root certificate is provided in the system trust store and the certificate contains the full chain.

[Vonng]

That do make sense