在 Go 模板里比较麻烦一点，我想到两个方式实现你可以参考下：
```plain
// templates/_helpers.tpl

{{- define "rules.join" -}}
{{- $rules := list "" -}}
{{- range . -}}
{{- $rules = append $rules (printf "PathPrefix(%q)" .) -}}
{{- end -}}
{{- join "||" (compact $rules) -}}
{{- end -}}
```

```plain
// templates/deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ include "joinexample.fullname" . }}
annotations:
oneline: '{{- range (initial .Values.paths) -}} {{- printf "PathPrefix(%q)||" . -}} {{- end -}} {{- printf "PathPrefix(%q)" (last .Values.paths) -}}'
byblock: {{ include "rules.join" .Values.paths }}
```