regexreplace

regexreplace(str string, pattern string, replace string) string

variable "branch" {
  description = "Git branch name"
  type        = string
}

computed "namespace" {
  description = "Kubernetes namespace derived from the branch"
  expression  = lower(regexreplace(var.branch, "[^a-z0-9]", "-"))
}

task "deploy-preview" {
  description = "Deploy a preview environment for this branch"
  commands = [
    "kubectl create namespace ${computed.namespace} --dry-run=client -o yaml | kubectl apply -f -",
    "helm upgrade --install preview-${computed.namespace} ./chart --namespace ${computed.namespace}",
  ]
}