Helmfile: presync hook namespace creation

gistfile1.txt

- events: ["presync"]
      showlogs: true
      command: "/bin/sh"
      args:
      - "-c"
      - >-
        kubectl get namespace "{{`{{ .Release.Namespace }}`}}" >/dev/null 2>&1 || kubectl create namespace "{{`{{ .Release.Namespace }}`}}";