[Tile-serving] [openstreetmap/mod_tile] Unable to generate webp tiles (Issue #301)

[Julien Richard-Foy]

I saw that there is `TYPE` setting but it seems only `png image/png` is supported. Is it possible to produce webp files? I’ve observed that webp files are less than half the size of their png equivalent for a very small loss of quality:

~~~ text
$ ls -hl
-rw-rw-r-- 1 julien julien 42K Dec 10 21:19 biella.png
-rw-rw-r-- 1 julien julien 16K Dec 10 21:50 biella.webp
~~~

biella.png:

![biella](https://user-images.githubusercontent.com/332812/206875839-99f96e95-8af9-405c-b244-cf05ebd3324f.png)

biella.webp:

![Screenshot from 2022-12-10 22-28-07](https://user-images.githubusercontent.com/332812/206875894-a157f327-c406-454d-a4c7-cfb76ae74a8b.png)


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