Make Matrix federation port configurable

Fixes #523 (Github Issue).

roles/matrix-base/defaults/main.yml

@@ -21,6 +21,8 @@ matrix_server_fqn_dimension: "dimension.{{ matrix_domain }}"
 # This is where you access Jitsi.
 matrix_server_fqn_jitsi: "jitsi.{{ matrix_domain }}"
 
+matrix_federation_public_port: 8448
+
 matrix_user_username: "matrix"
 matrix_user_groupname: "matrix"
 

roles/matrix-base/templates/static-files/well-known/matrix-server.j2

@@ -1,4 +1,4 @@
 #jinja2: lstrip_blocks: "True"
 {
-	"m.server": "{{ matrix_server_fqn_matrix }}:8448"
+	"m.server": "{{ matrix_server_fqn_matrix }}:{{ matrix_federation_public_port }}"
 }