Moved PHP docker to the PHP repository

[josvandervelde]

See openml/OpenML#1212.

For the https://github.com/openml/services/tree/feature/docker-compose, I've chosen to use elasticsearch 6.8.23 (same as production) for now.

I've updated openml/php-rest-api docker container to work with ES6. This is problematic for this server-api repo. A simple solution could be to create openml/php-rest-api:es8. What do you think?

[PGijsbers]

I think that's fine. Would also need to update the docker-compose.

[PGijsbers]

I think downgrading ES should accomplish the same thing?
There is still a minor issue of some ES errors, but those exists before the downgrade too.
Only when a tag is pushed for a dataset which already had tag(s)... but it's possible this happens in production too. I'll see if it reproduces or if it's a work item for this resource.

[codecov]

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##             main     #143   +/-   ##
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  Coverage        ?   91.93%           
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  Files           ?       49           
  Lines           ?     1823           
  Branches        ?      144           
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  Hits            ?     1676           
  Misses          ?      105           
  Partials        ?       42           

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[PGijsbers]

Doesn't reproduce for me. Doesn't even reproduce locally for me right now, but you can see it in CI (it's the SKIPS for the tag).