2483: Introduce FETCHMAIL_ENABLED r=mergify[bot] a=DjVinnii
## What type of PR?
Enhancement
## What does this PR do?
Add `FETCHMAIL_ENABLED` to enable/disable the Fetchmail functionality in the Admin UI.
### Related issue(s)
- closes#2127
## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.
- [x] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.
2535: fix the linux/arm/v7 build r=mergify[bot] a=nextgens
## What type of PR?
bug-fix
## What does this PR do?
The arm builder is running aarch64 ... and there is no package for arm/v7
Co-authored-by: Vincent Kling <v.kling@vinniict.nl>
Co-authored-by: Dimitri Huisman <diman@huisman.xyz>
Co-authored-by: Florent Daigniere <nextgens@freenetproject.org>
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