feat: add support for specifying an initial-network property

This network is the network that is associated with the container on creation. If specified, then the bridge network is not attached to the service.

Only a single initial network can be specified at this time.

README.md

@@ -44,6 +44,7 @@ postgres:logs <service> [-t|--tail] <tail-num-optional> # print the most recent
 postgres:pause <service>                           # pause a running postgres service
 postgres:promote <service> <app>                   # promote service <service> as DATABASE_URL in <app>
 postgres:restart <service>                         # graceful shutdown and restart of the postgres service container
+postgres:set <service> <key> <value>               # set or clear a property for a service
 postgres:start <service>                           # start a previously stopped postgres service
 postgres:stop <service>                            # stop a running postgres service
 postgres:unexpose <service>                        # unexpose a previously exposed postgres service
@@ -256,6 +257,25 @@ You can unlink a postgres service:
 dokku postgres:unlink lollipop playground
 ```
 
+### set or clear a property for a service
+
+```shell
+# usage
+dokku postgres:set <service> <key> <value>
+```
+
+Set the network to attach after the service container is started:
+
+```shell
+dokku postgres:set lollipop post-create-network custom-network
+```
+
+Unset the post-create-network value:
+
+```shell
+dokku postgres:set lollipop post-create-network
+```
+
 ### Service Lifecycle
 
 The lifecycle of each service can be managed through the following commands: