feat(GKE): Set the GITLAB_CONTINUOUS_PROFILING and GITLAB_TRACING...

Florian Forsterrequested to merge
fforster/tracing-gke into main

feat(GKE): Set the GITLAB_CONTINUOUS_PROFILING and GITLAB_TRACING environment variables by default.

These environment variables are used by Labkit to configure continuous profiling and tracing. Setting these variables by default allow these integrations to "just work", i.e. no additional configuration is required on the user's end.

The default values can be overwritten by the user, so they can disable continuous profiling and tracing by adding

example-service-k8s:
  spec:
    environment:
      GITLAB_CONTINUOUS_PROFILING: ""
      GITLAB_TRACING: ""

to their gke-service.yaml file.

Closes: team#662 (closed)

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