add geowebcache component to the helm chart

[edevosc2c]

Geowebcache is a component not really used by a lot of people, but it's actually officially supported in geOrchestra:

• https://github.com/georchestra/georchestra/tree/master/geowebcache-webapp
• https://github.com/georchestra/docker/blob/master/docker-compose.gwc.yml

This PR adds the ability to configure geowebcache standalone.

For the moment, it is a bit tricky to make it work because you have to pass the env JAVA_OPTIONS: -DGEOWEBCACHE_CONFIG_DIR=/etc/georchestra/geowebcache. But there will be soon an official way to support geowebcache.xml from the geOrchestra datadir instead of a separate geowebcache datadir.

[jeanpommier]

For the moment, it is a bit tricky to make it work because you have to pass the env JAVA_OPTIONS: -DGEOWEBCACHE_CONFIG_DIR=/etc/georchestra/geowebcache. But there will be soon an official way to support geowebcache.xml from the geOrchestra datadir instead of a separate geowebcache datadir.

I don't really understand what you mean by this, I can't relate it with the code I'm seeing. Can you explain it a bit more ?

[edevosc2c]

For the moment, it is a bit tricky to make it work because you have to pass the env JAVA_OPTIONS: -DGEOWEBCACHE_CONFIG_DIR=/etc/georchestra/geowebcache. But there will be soon an official way to support geowebcache.xml from the geOrchestra datadir instead of a separate geowebcache datadir.

I don't really understand what you mean by this, I can't relate it with the code I'm seeing. Can you explain it a bit more ?

Geowebcache requires geowebcache.xml to work, by default it's stored in /mnt/geowebcache_datadir, a separate volume. You can see here, on a first start the file is copied: https://github.com/georchestra/georchestra/blob/master/geowebcache-webapp/src/docker/docker-entrypoint.d/00-geowebcache-bootstrap#L9

The issue is that it's "dumb" to have a whole PVC (volume) for just a single file.

So we will plan to add the support for this file geowebcache.xml in the geOrchestra datadir.