Merge pull request 'update example, add mail_enabled env [skip-ci]' (#18) from dev into main

Reviewed-on: #18

docker-compose.yml

@@ -3,6 +3,7 @@ services:
     build: .
     container_name: semapform
     environment:
+      - MAIL_ENABLED=${MAIL_ENABLED:-false}
       - SMTP_HOST=${SMTP_HOST:-smtp}
       - SMTP_PORT=${SMTP_PORT:-25}
       - MAIL_FROM=${MAIL_FROM:-noreply@example.com}