Add base nginx and tika docker setup

[navarone-feekery]

Related to https://github.com/elastic/enterprise-search-team/issues/4577

Adds a docker image built on openresty alpine. This will also download the jar for tika-server and run it as a service in the background.

To test this:

$ docker build --platform=linux/arm64 -t extraction-service .
$ docker run -p 8090:8090 -t extraction-service

Then go into the container and check if tika is running

$ rc-status

Note: This runs all the services correctly, but does not yet extract data. I just want to get the base working docker image on the repo before expanding it more.

[navarone-feekery]

IT PASSED CI!!!

[seanstory]

IT PASSED CI!!!

Note that "CI" is very loose right now 😅 essentially just a

docker build
docker push

[navarone-feekery]

And yet it failed until now, so progress :D