feat: implement container network attaching

Containers can be attached:

- after they are created, but before they are started
- after a successful deploy, but before the proxy reloads

This allows folks to have flexibility around when they would like a container to be made available to a network.

plugins/network/.gitignore

@@ -1,10 +1,9 @@
 /commands
+/core-post-deploy
 /subcommands/*
 /triggers/*
 /triggers
 /network-*
 /install
-/post-app-clone-setup
-/post-create
-/post-delete
+/post-*
 /report