Make foodsoft/gitea ports optional

Closes https://git.autonomic.zone/coop-cloud/traefik/issues/23.

.env.sample

@@ -17,9 +17,11 @@ LOG_LEVEL=WARN
 #SMTP_ENABLED=1
 
 ## Gitea SSH
+# COMPOSE_FILE="compose.yml:compose.gitea.yml"
 # GITEA_SSH_ENABLED=1
 
 ## Foodsoft SMTP
+# COMPOSE_FILE="compose.yml:compose.foodsoft.yml"
 # FOODSOFT_SMTP_ENABLED=1
 
 ## Host-mode networking

compose.foodsoft.yml

@@ -0,0 +1,5 @@
+version: "3.8"
+services:
+  app:
+    ports:
+      - "2525:2525"

compose.gitea.yml

@@ -0,0 +1,5 @@
+version: "3.8"
+services:
+  app:
+    ports:
+      - "2222:2222"

compose.yml

@@ -2,11 +2,12 @@ version: "3.8"
 services:
   app:
     image: "traefik:v2.4.8"
+    # Note(decentral1se): *please do not* add any additional ports here.
+    # Doing so could break new installs with port conflicts. Please use
+    # the usual `compose.$name.yml` approach for any additional ports
     ports:
       - "80:80"
       - "443:443"
-      - "2222:2222"
-      - "2525:2525"
     volumes:
       - "/var/run/docker.sock:/var/run/docker.sock"
       - "letsencrypt:/etc/letsencrypt"