Update cheatsheets

gcloud-container

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gcloud container
+
+> Manage containerized applications on Kubernetes and clusters.
+> See also: `gcloud`.
+> More information: <https://cloud.google.com/sdk/gcloud/reference/container>.
+
+- Register `gcloud` as a Docker credential helper:
+
+`gcloud auth configure-docker`
+
+- Create a cluster to run GKE containers:
+
+`gcloud container clusters create {{cluster_name}}`
+
+- List clusters for running GKE containers:
+
+`gcloud container clusters list`
+
+- Update kubeconfig to get `kubectl` to use a GKE cluster:
+
+`gcloud container clusters get-credentials {{cluster_name}}`
+
+- List tag and digest metadata for a container image:
+
+`gcloud container images list-tags {{image}}`