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Kubernetes node selector questions

I can't understand how the kubernetes node selector table should be expressed, the configuration says:

https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/blob/master/docs/configuration/advanced-configuration.md#the-runnerskubernetes-section

node_selector: A table of key=value pairs of string=string. Setting this limits the creation of pods to kubernetes nodes matching all the key=value pairs

Then i find the following example:

  [runners.kubernetes.node_selector]
        gitlab = "true"
        image_pull_secrets = ["docker-registry-credentials"]

Then reading the toml documentation about tables (https://github.com/toml-lang/toml#table), they say:

[table-1]
key1 = "some string"
key2 = 123

[table-2]
key1 = "another string"
key2 = 456

Now, my doubts:

  1. What does represent the gitlab = "true" ? A pair of key=value ?
  2. If [runners.kubernetes.node_selector] is a table of node key=value node selectors, why we find image_pull_secrets there ?
  3. Taking for example, this set of labels of google gke cluster:
Labels:		beta.kubernetes.io/arch=amd64
			beta.kubernetes.io/instance-type=n1-standard-1
			beta.kubernetes.io/os=linux
			cloud.google.com/gke-nodepool=default-pool
			failure-domain.beta.kubernetes.io/region=europe-west1

How they should be represented in a valid toml ?

  1. Is this node selector also valid for the auto-deploy image https://gitlab.com/gitlab-examples/kubernetes-deploy/blob/master/deploy ? Just looking at this file, i would say no.

Thanks a lot!