Is your feature request related to a problem?

There is no documentation of all possible DOVECOT_ prefixed enivronment variables:

• DOVECOT_BASE
• DOVECOT_DEFAULT_PASS_SCHEME
• DOVECOT_DN
• DOVECOT_DNPASS
• DOVECOT_HOSTS
• DOVECOT_LDAP_VERSION
• DOVECOT_AUTH_BIND

Currently documented:

• DOVECOT_MAILBOX_FORMAT
• DOVECOT_TLS
• DOVECOT_USER_FILTER
• DOVECOT_USER_ATTRS
• DOVECOT_PASS_FILTER
• DOVECOT_PASS_ATTRS

Describe the solution you'd like

Create a section for each DOVECOT_ variable in README.md

Alternatives you've considered

Describe that most DOVECOT_ variables are injected by configomat processing dovecot-ldap.conf.ext on start.

Who will that feature be useful to?

Everyone, who want to use one of these LDAP specific variables, e.g. DOVECOT_AUTH_BIND for better LDAP pasword features.

What have you done already?

I figured out:
Beside DOVECOT_MAILBOX_FORMAT, which is used here, all DEVOCOT_ variables are gerenated by configomat.

What are you going to contribute?

I can create a PR for adding these vars to documention, soon. If someone else is faster, just do it please.

Additional context

Its connected to the helm-docker-mailserver issue #31