autojoin room config

.env.sample

@@ -15,6 +15,9 @@ COMPOSE_FILE="compose.yml"
 
 #DISABLE_FEDERATION=1
 
+#AUTO_JOIN_ROOM_ENABLED=1
+#AUTO_JOIN_ROOM="#example:example.com"
+
 #COMPOSE_FILE="compose.yml:compose.keycloak.yml"
 #KEYCLOAK_ENABLED=1
 #KEYCLOAK_NAME=

compose.yml

@@ -12,6 +12,8 @@ services:
       - macaroon_secret_key
       - form_secret
     environment:
+      - AUTO_JOIN_ROOM
+      - AUTO_JOIN_ROOM_ENABLED
       - DISABLE_FEDERATION
       - DOMAIN
       - LETSENCRYPT_HOST=${DOMAIN}

homeserver.yaml.tmpl

@@ -1299,8 +1299,10 @@ account_threepid_delegates:
 # If the room already exists, make certain it is a publicly joinable
 # room. The join rule of the room must be set to 'public'.
 #
-#auto_join_rooms:
-#  - "#example:example.com"
+{{ if eq (env "AUTO_JOIN_ROOM_ENABLED") "1" }}
+auto_join_rooms:
+  - "{{ env "AUTO_JOIN_ROOM" }}"
+{{ end }}
 
 # Where auto_join_rooms are specified, setting this flag ensures that the
 # the rooms exist by creating them when the first user on the