use gke-gcloud-auth-plugin for longer-lived token #190
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Motivation
We swapped to an action to auth and used the
short-lived
token option in #189. After merging, we ran into the error in our charts that the$AUTH_SESSION_CLIENT_SECRET
env var was not set.Approach
I am guessing that this was set as part of our previous credential steps, and that the short-lived token option doesn't set this. This seems to be the only other thing we can tweak, so educated guess that this option will enable the option that sets this env var.
Based on information within google-github-actions/setup-gcloud#561.