Merge #3729

3729: Allow setting collation via env variable and add uvloop r=mergify[bot] a=Grennith

## What type of PR?

Enhancement / Bugfix

## What does this PR do?

As of https://github.com/Mailu/Mailu/pull/3701, the collation shall be set by overwriting `SQLALCHEMY_DATABASE_URI` to contain the collation of the related DB. However, this is currently not possible in the Helm chart of Mailu at all. It's statically set there and would also require not setting DB_NAME etc. to not have it overwritten, see https://github.com/Mailu/Mailu/blob/master/core/admin/mailu/configuration.py#L144

Additionally, uvloop is added to the prod requirements of which postfix-mta-sts-resolver makes use of.

### Related issue(s)
- Mention an issue like: #3449 

## 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
- [ ] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.


Co-authored-by: Till Skrodzki <till@mueskro.de>

core/admin/mailu/configuration.py

@@ -25,6 +25,7 @@ DEFAULT_CONFIG = {
     'DB_PW': None,
     'DB_HOST': 'database',
     'DB_NAME': 'mailu',
+    'DB_APPENDIX': '',
     'SQLITE_DATABASE_FILE': 'data/main.db',
     'SQLALCHEMY_DATABASE_URI': 'sqlite:////data/main.db',
     'SQLALCHEMY_DATABASE_URI_ROUNDCUBE': 'sqlite:////data/roundcube.db',
@@ -102,8 +103,8 @@ class ConfigManager:
 
     DB_TEMPLATES = {
         'sqlite': 'sqlite:////{SQLITE_DATABASE_FILE}',
-        'postgresql': 'postgresql://{DB_USER}:{DB_PW}@{DB_HOST}/{DB_NAME}',
-        'mysql': 'mysql+mysqlconnector://{DB_USER}:{DB_PW}@{DB_HOST}/{DB_NAME}',
+        'postgresql': 'postgresql://{DB_USER}:{DB_PW}@{DB_HOST}/{DB_NAME}{DB_APPENDIX}',
+        'mysql': 'mysql+mysqlconnector://{DB_USER}:{DB_PW}@{DB_HOST}/{DB_NAME}{DB_APPENDIX}',
     }
 
     def __init__(self):

core/base/requirements-dev.txt

@@ -46,6 +46,7 @@ watchdog
 
 # core/postfix
 postfix-mta-sts-resolver
+uvloop
 
 # core/oletools
 python-magic
@@ -56,4 +57,3 @@ requests
 
 # optional/radicale
 radicale
-

core/base/requirements-prod.txt

@@ -78,6 +78,7 @@ tabulate==0.9.0
 tenacity==8.2.3
 typing_extensions==4.11.0
 urllib3==2.2.1
+uvloop==0.21.0
 validators==0.28.1
 visitor==0.1.3
 vobject==0.9.7