Feature Request

Context

check-for-changes.sh script is constantly (every second) hashing and writing unnecessary to host filesystem.

Is your Feature Request related to a Problem?

Reduce unnecessary disk IO.

Describe the Solution you'd like

Wait and hash only if change was detected.

Are you going to implement it?

I have just a quick hack but it depends on package inotify-tools.
I have added in check-for-changes.sh before line 46:

  inotifywait -r \
          /tmp/docker-mailserver \
          /etc/letsencrypt/acme.json \
          "/etc/letsencrypt/live"

But this snippet is not heavily. Have just add it to my container.