1158: Use nginx for kubernetes ingress r=kaiyou a=micw
## What type of PR?
enhancement
## What does this PR do?
Currently, kubernetes uses a complex ingress setting which is not portable across different ingress controllers. This PR simplifies the ingress and delegates everythins special to Mailu to the front container,
### Related issue(s)
- closes#1121
- closes#1117
- closes#1021
- closes#1045
## Prerequistes
- [x] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog]
Co-authored-by: Michael Wyraz <michael@wyraz.de>
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.
Allows to use mailu without docker-compose when hostnames are not set up
by docker itself but provided via a separate resolver.
Use case: use mailu using nomad scheduler and consul resolver instead of
docker-compose. Other servers are provided by the DNS resolver that
resolves names like admin.service.consul or webmail.service.consul.
These names needs to be configurable.
Michael Wyraz