Added more matrix constants for easier debugging and readability

roles/web-app-matrix/templates/mautrix/signal.config.yml.j2

@@ -3,7 +3,7 @@ homeserver:
     # The address that this appservice can use to connect to the homeserver.
     address: http://synapse:8008
     # The domain of the homeserver (also known as server_name, used for MXIDs, etc).
-    domain: {{applications | get_app_conf(application_id, 'server_name', True)}}
+    domain: {{ MATRIX_SERVER_NAME }}
 
     # What software is the homeserver running?
     # Standard Matrix homeservers like Synapse, Dendrite and Conduit should just use "standard" here.
@@ -141,7 +141,7 @@ bridge:
     federate_rooms: true
     # Servers to always allow double puppeting from
     double_puppet_server_map:
-        {{applications | get_app_conf(application_id, 'server_name', True)}}: {{ MATRIX_SYNAPSE_URL }}
+        {{ MATRIX_SERVER_NAME }}: {{ MATRIX_SYNAPSE_URL }}
     # Allow using double puppeting from any server with a valid client .well-known file.
     double_puppet_allow_discovery: false
     # Shared secrets for https://github.com/devture/matrix-synapse-shared-secret-auth
@@ -150,7 +150,7 @@ bridge:
     # instead of users having to find an access token and run `login-matrix`
     # manually.
     login_shared_secret_map:
-        {{applications | get_app_conf(application_id, 'server_name', True)}}: {{applications | get_app_conf(application_id, 'credentials.registration_shared_secret', True)}}
+        {{ MATRIX_SERVER_NAME }}: {{ MATRIX_REGISTRATION_SHARED_SECRET }}
 
     # Maximum time for handling Matrix events. Duration strings formatted for https://pkg.go.dev/time#ParseDuration
     # Null means there's no enforced timeout.
@@ -274,8 +274,8 @@ bridge:
     #     mxid - Specific user
     permissions:
         "*": relay
-        "{{applications | get_app_conf(application_id, 'server_name', True)}}": user
-        "@{{applications | get_app_conf(application_id, 'users.administrator.username', True)}}:{{applications | get_app_conf(application_id, 'server_name', True)}}": admin
+        "{{ MATRIX_SERVER_NAME }}": user
+        "@{{ MATRIX_ADMINISTRATOR_USERNAME }}:{{ MATRIX_SERVER_NAME }}": admin
 
     # Settings for relay mode
     relay: