How to integrate GitLab with Jaeger in kubernetes

I am trying to integrate Gitlab with Jaeger for distributed tracing.
I have installed Gitlab instance and jaeger on kubernetes (AKS).
As per documentation i need to set a environment variable "export GITLAB_TRACING=“opentracing://jaeger?http_endpoint=http%3A%2F%2Flocalhost%3A14268%2Fapi%2Ftraces&sampler=const&sampler_param=1"”
But I am not sure how i set this env variable in kubernetes.
Any help/suggestion