增强模板渲染能力支持类似helm的 include 渲染提前解析的定义模板

[mumuhhh]

Your current KubeKey version

4.0.3

Describe this feature

利用预定义模板 减少模板声明

Describe the solution you'd like

例如在模板文件 platform.tpl 中定义

{{- define "images.platform.list" }}
{{- $platform := list }}
{{- range . }}
  {{- $platform = append $platform (printf "linux/%s" .) }}
{{- end }}
{{- $platform | toJson }}
{{- end -}}

之后在其他变量或模板中复用

{{- include "images.platform.list" .download.arch -}}

由于模板解析非线程安全所以应当在project加载之初提前解析加载模板定义
变量解析时 Clone() project持有的模板 再解析渲染变量或者模板文件
@redscholar

Additional information

No response

[mumuhhh]

test_playbook.yaml

---
- hosts:
    - localhost
  gather_facts: true
  tasks:
    - name: httpGetFile | Download container images
      loop: >-
        {{- include "versions.archs.list" . -}}
      when: '{{ fileExists (join "/" (list .binary_dir (base (tpl .artifact_url .item)))) | not }}'
      http_get_file:
        url: "{{ tpl .artifact_url .item }}"
        dest: '{{ join "/" (list .binary_dir (base (tpl .artifact_url .item)))}}'
  vars:
    archs: ["amd64"]
    versions: ["v2.10.1","v2.10.2"]
    binary_dir: ./tmp/
    artifact_url: >-
      https://github.com/caddyserver/caddy/releases/download/
      {{- "{{ .version }}" }}/caddy_
      {{- "{{trimPrefix \"v\" .version}}" }}_linux_{{ "{{.arch}}" }}.tar.gz

templates/_commons.tpl

{{- define "versions.archs.list" }}
{{- $result := list -}}
{{- range $arch := $.archs }}
  {{- range $version := $.versions }}
    {{- $result = append $result (dict
        "arch" $arch
        "version" $version)
    -}}
  {{- end }}
{{- end }}
{{- toJson $result }}
{{- end -}}