feat: add email notifications

      SEMAPHORE_TOTP_ENABLED: "True"

      SEMAPHORE_SCHEDULE_TIMEZONE: "Europe/Amsterdam"

      # semaphore email

      SEMAPHORE_EMAIL_SENDER: "{{ semaphore_email_sender }}"

      SEMAPHORE_EMAIL_USERNAME: "{{ semaphore_email_username }}"

      SEMAPHORE_EMAIL_HOST: "{{ semaphore_email_host }}"

      SEMAPHORE_EMAIL_PORT: "{{ semaphore_email_port }}"

      SEMAPHORE_EMAIL_PASSWORD: "{{ semaphore_email_password }}"

      SEMAPHORE_EMAIL_SECURE: "True"

      SEMAPHORE_EMAIL_TLS: "True"

      # global

      TZ: "{{ timezone }}"