Implement media caching

[OniriCorpe]

Problem

• local medias are not cached

Solution

• implement caching of the local medias in the nginx config

PR Status

• [x] Code finished and ready to be reviewed/tested
• [x] The fix/enhancement were manually tested (if applicable)

[lapineige]

Oh that's why the storage usage was so low… Do you have an idea of the storage impact ? Any command to clean/limit the amount of cache ?

[OniriCorpe]

It's caching of media served by the GTS server, not the received ones by the GTS server

It's to lighten the workload on the GTS server when there's a high demand for media (when a post is relayed a lot, for example)

Not for storing distant medias, which is managed by the GTS server itself (this is configured on the GTS config file)

So the storage impact of this PR is non existent!

[lapineige]

Oh, nice ! :+1: Thanks for doing this :tada: