es-diagnostics docker image

Michal Wasilewskirequested to merge
michalw/es-diagnostics into master

refs: https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/10234

Creates a docker image that contains tools for gathering ES diagnostics. The intention is to run it as a cron job inside k8s.

Signed-off-by: Michal Wasilewski mwasilewski@gitlab.com

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