feat: make smtp settings configurable in .env

releases/next

@@ -0,0 +1,14 @@
+Add SMTP Config to your .env file:
+
+``` 
+# COMPOSE_FILE="$COMPOSE_FILE:compose.smtp.yml"
+# See https://github.com/nextcloud/docker#auto-configuration-via-environment-variables for default values
+# SMTP_AUTHTYPE=
+# SMTP_HOST=
+# SMTP_SECURE=
+# SMTP_NAME=
+# SMTP_PORT=
+# MAIL_FROM_ADDRESS=
+# MAIL_DOMAIN=
+# SECRET_SMTP_PASSWORD_VERSION=v1
+```