XDOCKER-87: Automatically build SOLR docker image with compose

[ASHISH932]

No description provided.

[ASHISH932]

FTR:
build.gradle
template/solr/Dockerfile
template/solr/docker-compose.yml
template/solr/solr-init.sh (same as in contrib/solr)

[vmassol]

Note: this PR supersedes #14

[vmassol]

This PR was discussed on matrix (https://matrix.to/#/!ikPtGZaGWtyblizzlR:matrix.xwiki.com/$1564651451225975nhSFW:matrix.org?via=matrix.xwiki.com&via=matrix.org&via=matrix.wina.be). The conclusion is:

• We don't need a custom SOLR image for XWiki. We should use the official SOLR image and configure it for XWiki using a compose file for example.
• However, it's interesting to have a example of such a compose file in the github repo and in the doc
• It's also interesting to make the xwiki image easily configurable to use an external solr instance (by exposing a "docker run" command line parameter for that).

Thanks @ASHISH932 !

[vmassol]

ping @ASHISH932 about my last comment. Are you active on this PR? What's your plan? Thx!

[ASHISH932]

Currently, I'm not working on this PR but would possibly update it later. Since our conclusion is to create a docker-compose file only, so the changes would happen in README file only. So if you want to close the PR, for now, you could.

[vmassol]

I don't think the change is only a README change. See above where I mentioned:

It's also interesting to make the xwiki image easily configurable to use an external solr instance (by exposing a "docker run" command line parameter for that).

Otherwise how do you set it in a compose file?

[ASHISH932]

This parameter is already exposed. We can use external solr with our container
https://github.com/xwiki-contrib/docker-xwiki/blob/master/README.md#using-an-external-solr-service

Is that what you mean ?

[vmassol]

This parameter is already exposed. We can use external solr with our container
https://github.com/xwiki-contrib/docker-xwiki/blob/master/README.md#using-an-external-solr-service

Is that what you mean ?

Indeed, I guess it was done in a different PR.

Note: The doc doesn't explain how the solr.remote property is set so that could be improved in the doc but it's minor.

So I agree it's only doc that's remaining.

Thx