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Today I learned that docker creates an empty /.dockerenv file to indicate that
you are running in a docker container. Other runtimes like podman commonly use
/run/.containerenv. kubernetes uses neither of these, the most common way to
detect if you are running in kubernetes is to check for the presence of the
KUBERNETES_SERVICE_HOST environment variable. There will also be a directory
at /var/run/secrets/kubernetes.io/serviceaccount that contains the service
account credentials if you are running in kubernetes.