Added tests for network configuration option

lib/kamal/configuration/docs/accessory.yml

@@ -90,3 +90,11 @@ accessories:
     # They are not created or copied before mounting:
     volumes:
       - /path/to/mysql-logs:/var/log/mysql
+
+    # Network
+    #
+    # The network the accessory will be attached to.
+    #
+    # Defaults to kamal:
+    network: custom
+

lib/kamal/configuration/docs/configuration.yml

@@ -176,3 +176,10 @@ logging:
 # Alias configuration, see kamal docs alias:
 aliases:
   ...
+
+# Network
+#
+# The network the application will be attached to.
+#
+# Defaults to kamal:
+network: custom

lib/kamal/configuration/docs/proxy.yml

@@ -103,3 +103,10 @@ proxy:
   # By default, kamal-proxy will not forward the headers if the `ssl` option is set to `true`, and
   # will forward them if it is set to `false`.
   forward_headers: true
+
+  # Network
+  #
+  # The network the proxy container will be attached to.
+  #
+  # Defaults to kamal:
+  network: custom