QWC uWSGI Base

QWC docker uWSGI base images for QWC services.

Multiple environment variables are available:

Variable	Description	Default value
`LOCALE`	For the ubuntu-based `qwc-uwsgi-base`, defines the runtime locale in the form `lang_COUNTRY` (i.e. `de_CH`)	`en_US`
`PGSERVICEFILE`	Path to pg_service.conf file	`/srv/pg_service.conf`
`REQ_HEADER_BUFFER_SIZE`	Internal uWSGI buffer size	`12288`
`SERVICE_GID`	GID used for running the service	`33`
`SERVICE_MOUNTPOINT`	Route from which the service will be mounted (e.g. `/api/v1/feature-info`)	`/`
`SERVICE_UID`	UID used for running the service	`33`
`UV_COMPILE_BYTECODE`	Enable UV byte code compilation	`1`
`UWSGI_EXTRA`	Extra parameter to pass to uWSGI command line - see below	empty
`UWSGI_PROCESSES`	Number of uWSGI processes to spawn	`1`
`UWSGI_THREADS`	Number of uWSGI threads for each processes	`4`

Extra uWSGI parameters

When using UWSGI_EXTRA, there are some caveats:

The variable will be expanded as a single argument, thus you should use UWSGI_EXTRA: --parameter-name=parameter-value, not UWSGI_EXTRA: --parameter-name parameter-value
As a consequence, you cannot use multiple parameters. A workaround is to use a mounted uwsgi.ini file, for instance:
1. define UWSGI_EXTRA: --ini=/etc/uwsgi.ini
2. add the parameters in a uwsgi.ini file:
```
[uwsgi]
logdate = %%Y-%%m-%%d %%H:%%M:%%S
logformat-strftime = true
logformat = [%(ftime).%(msecs)] "%(method) %(uri) %(proto)" %(status)
```
3. mount that file in your Docker container