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Add GOMEMLIMIT env variable

Dmitry Gruzd requested to merge add-gomemlimit-to-zoekt-indexer into main

This MR adds GOMEMLIMIT for gitlab-zoekt-indexer to solve OOM issues when indexing large repositories (gitlab-org/gitlab-zoekt-indexer#11 (closed)). Our suspicion is that Go runtime doesn't free memory because GOMEMLIMIT is not set.

Steps to verify

  1. helm install gitlab-zoekt . --set indexer.gomemlimit=100MiB
  2. Ensure that kubectl describe pods gitlab-zoekt-0 returns 
    Environment:
  GOMEMLIMIT:  100MiB

for zoekt-indexer

Edited by Dmitry Gruzd

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