feat: Connect to Redis for populating search

[simonj2]

What

This PR connects the Server to the search service so that new writes are populated. See the search service here: https://github.com/openfoodfacts/openfoodfacts-search

• The writes are contained in an eval statement, so there shouldn't be any effect if the Redis instance is down (such as now).
• The search Redis host is located via an env config, just like Robotoff.
• See corresponding search service PR: feat: Set network dynamically + docker improvements search-a-licious#9 (merged by now).

[alexgarel]

@simonj2 really good. I put it on "draft" state to be clear it's not yet ready.

[simonj2]

@stephanegigandet @teolemon - this is ready for review now :)

[alexgarel]

@simonj2 thanks a lot for this PR, nice work.

I would just prefer we keep connection, and move it to a specific file (but you may argue against it :-) )

[simonj2]

Updating to draft since I'm having some trouble getting this to work, and want to use this as a platform to ask for some 👀

[simonj2]

This is ready for review again and passing all manual testing. Thanks for the help @alexgarel + @stephanegigandet

[alexgarel]

LGTM

[alexgarel]

Thanks a lot @simonj2 :-)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[stephanegigandet]

Looks good, thank you!

[alexgarel]

I will merge, but for it to be effective we will have to change deployment CI to add redis parameter, but I'll do it on a separate PR.