Provides a minimal IMAP server docker image based on our Alpine Linux 3.12 base image and Dovecot.
This image can be used to provide a simple IMAP server for testing and development.
By default, one IMAP user imap with the password imap is created.
This can be changed by setting the IMAP_USERS environment variable to a space-separated list
of username:password entries.
Some environments require SSL to be enabled, so enable in dovecot.conf if necessary.
You can set the IMAP namespace separator e.g. to / in conf.d/10-mail.conf.
To use the dovecot package configuration files, the last line in dovecot.conf must be uncommented.