Update cheatsheets

gcloud-iam

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gcloud iam
+
+> Configure Identity and Access Management (IAM) preferences and service accounts.
+> See also: `gcloud`.
+> More information: <https://cloud.google.com/sdk/gcloud/reference/iam>.
+
+- List IAM grantable roles for a resource:
+
+`gcloud iam list-grantable-roles {{resource}}`
+
+- Create a custom role for a organization or project:
+
+`gcloud iam roles create {{role_name}} --{{organization|project}} {{organization|project_id}} --file {{path/to/role.yaml}}`
+
+- Create a service account for a project:
+
+`gcloud iam service-accounts create {{name}}`
+
+- Add an IAM policy binding to a service account:
+
+`gcloud iam service-accounts add-iam-policy-binding {{service_account_email}} --member {{member}} --role {{role}}`
+
+- Replace existing IAM policy binding:
+
+`gcloud iam service-accounts set-iam-policy {{service_account_email}} {{policy_file}}`
+
+- List a service account's keys:
+
+`gcloud iam service-accounts keys list --iam-account {{service_account_email}}`