985: Permit raspberry pi (and other architectures) builds r=mergify[bot] a=abondis
## What type of PR?
Enhancement
## What does this PR do?
Add an option to select base images and permit building for different CPU architectures.
### Related issue(s)
N/A
## Prerequistes
- [X] documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file.
Co-authored-by: Aurélien Bondis <aurelien.bondis@gmail.com>
Co-authored-by: Aurelien <aurelien.bondis@gmail.com>
In case of TLS_FLAVOR=[mail,cert], the user supplies their own certificates.
However, since nginx is not aware of changes to these files, it cannot
reload itself e.g. when the certs get renewed.
To solve this, let’s add a small daemon in the place of
`letsencrypt.py`, which uses a flexible file-watching framework and
reloads nginx in the case the certificates change ….
To facilitate this, the default redirect at / can be disabled, even if
the default remains at redirecting to the webmailer.
The extensions are within the host scope and are read from
$ROOT/overrides/nginx/*.conf.
- Specified seperated /health path in order to allow for healthcheck even if webmail and admin are not seletectd. This also allows healthchecking fom external services like DNS load balancers;
- Make curl not to fail on TLS because localhost is not included in the certificates.
