anchor.diff:     initialization
    * PG_LOCALE - if set, the locale you want to create the database with, if
      not set, the default locale is used
  - * SYNC_REPLICA - if set, this value is used to specify the application_name
  + * SYNC_SLAVE - if set, this value is used to specify the application_name
      of a replica that will be used for a synchronous replication
    * CHECKSUMS - if set, this value is used to enable the *--data-checksums*
      option when initdb is executed at initialization, if not set, the
  
positive.code: 
  === Environment Variables
  
   * PG_MODE - either *master*, *replica* or *set*, this value determines whether
     the database is set up as a master or replica instance, in the
     case of *set*, it means the container is started within a StatefulSet
     in a Kubernetes cluster.
  
negative.code:  * PG_USERNAME - user to connect to PostgreSQL
   * PG_PASSWORD - user password to connect to PostgreSQL
   * PG_MASTER_SERVICE_NAME - database host to connect to for the master node
   * PG_SLAVE_SERVICE_NAME - database host to connect to for the replica node
  
  === Features
  
  