Add crang cluster

clusters/crang-values.yaml

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+---
+namespaces:
+- name: crang-main
+  ingress:
+    enabled: true

clusters/crang.yaml

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+account-id: "011571571136"
+account-name: "sandbox"
+account-role-arn: "arn:aws:iam::011571571136:role/deployer"
+ci-worker-count: 1
+ci-worker-instance-type: t3.medium
+cluster-domain: "london.crang.govsvc.uk"
+cluster-name: "crang"
+cluster-number: "102"
+concourse-pipeline-name: "crang-deployer"
+concourse-team: "gsp"
+concourse-url: "https://cd.gds-reliability.engineering"
+concourse-username: "gsp"
+config-approval-count: 0
+config-approvers: ["samcrang"]
+config-organization: "alphagov"
+config-path: "clusters/crang.yaml"
+config-repository: "tech-ops-cluster-config"
+config-trigger: true
+config-uri: "https://github.com/alphagov/tech-ops-cluster-config.git"
+config-values-path: "clusters/crang-values.yaml"
+config-version: "crang-cluster"
+disable-destroy: false
+eks-version: "1.14"
+enable-nlb: false
+github-client-id: "NOTID"
+github-client-secret: "NOTASECRET"
+google-oauth-client-id: "NOTASECRET"
+google-oauth-client-secret: "NOTID"
+hsm-splunk-hec-token: "NOTATOKEN"
+hsm-splunk-index: "NOTAURL"
+k8s-splunk-hec-token: "NOTATOKEN"
+k8s-splunk-index: "NOTAURL"
+maximum-workers-per-az-count: 3
+minimum-workers-per-az-count: 2
+platform-pre-release: true
+platform-resource-type: git
+platform-tag-filter: ""
+platform-version: "harbor-rds"
+splunk-enabled: "0"
+splunk-hec-url: "NOTAURL"
+trusted-developer-keys: []
+users-trigger: true
+vpc-flow-log-splunk-hec-token: "NOTATOKEN"
+vpc-flow-log-splunk-index: "NOTAURL"
+worker-instance-type: t3.large