Use explicit network aliases, add appservice registration script

servers/mautrix/slack/config.yaml

@@ -226,7 +226,7 @@ appservice:
     # Like the homeserver address, a local non-https address is recommended when the bridge is on the same machine.
     # If the bridge is elsewhere, you must secure the connection yourself (e.g. with https or wireguard)
     # If you want to use https, you need to use a reverse proxy. The bridge does not have TLS support built in.
-    address: http://mautrix-slack:29335
+    address: http://as-mautrix-slack:29335
     # A public address that external services can use to reach this appservice.
     # This is only needed for things like public media. A reverse proxy is generally necessary when using this field.
     # This value doesn't affect the registration file.

servers/mautrix/slack/registration.yaml

@@ -1,5 +1,5 @@
 id: slack
-url: http://mautrix-slack:29335
+url: http://as-mautrix-slack:29335
 as_token: hKvxR9H2FUQusZY5Ug7JWtrOqugLLU3m8kIQnGApTTIYGTbIvKNOS0bFv1BAAtwg
 hs_token: SptrHkculXlvYvMUHwv1Tmr7TxnfD9RY6NKM89mTXgdMkgKC6j9WdlDOUWvxuTd5
 sender_localpart: BPv5f9VoCPflaOvndjDnG56dgLLeTq7g