Make host-mode networking optional..

..and add missing LETS_ENCRYPT_EMAIL to example env

.envrc.sample

@@ -4,6 +4,7 @@ export STACK_NAME=traefik
 export DOMAIN=traefik.example.com
 export LETS_ENCRYPT_ENV=production
 
+export LETS_ENCRYPT_EMAIL=certs@example.com
 # export DASHBOARD_ENABLED=true
 # WARN, INFO etc.
 export LOG_LEVEL=WARN
@@ -19,3 +20,6 @@ export TRAEFIK_YML_VERSION=v1
 ## SMTP port 587
 #export COMPOSE_FILE="compose.yml:compose.smtp.yml"
 #export SMTP_ENABLED=1
+
+## Host-mode networking
+#export COMPOSE_FILE="compose.yml:compose.host.yml"

compose.host.yml

@@ -0,0 +1,15 @@
+---
+version: "3.8"
+
+services:
+  traefik:
+    ports:
+      - target: 80
+        published: 80
+        mode: host
+      - target: 443
+        published: 443
+        mode: host
+      - target: 2222
+        published: 2222
+        mode: host

compose.yml

@@ -5,15 +5,9 @@ services:
   traefik:
     image: "traefik:2.3.2"
     ports:
-      - target: 80
-        published: 80
-        mode: host
-      - target: 443
-        published: 443
-        mode: host
-      - target: 2222
-        published: 2222
-        mode: host
+      - "80:80"
+      - "443:443"
+      - "2222:2222"
     volumes:
       - "/var/run/docker.sock:/var/run/docker.sock"
       - "letsencrypt:/etc/letsencrypt"