Improvement: multiple key's prefixes in templates like in envconsul

[pznamensky]

Recently @schmichael implemented envconsul-like support #2654. But as mentioned in closed #1765 it would be great to support multiple prefixes.
We are using multiple prefixes in envconsul when executing some applications. And it is very convenient.
Didn't you think about adding ability to merge keys from multiple prefixes in nomad's template?

[dadgar]

Hey this can be achieved already:

       template {
         data          = <<EOF
{{ range ls "foo/" }}
{{ .Key }}={{ .Value }}{{ end }}
         EOF
         destination   = "local/file.yml"
         env = true
       }

[pznamensky]

Indeed keys from multiple prefixes are merged.
@dadgar, thanks!

       template {
         data          = <<EOF
{{ range ls "global/" }}
{{ .Key }}={{ .Value }}{{ end }}
{{ range ls "app/appname" }}
{{ .Key }}={{ .Value }}{{ end }}
         EOF
         destination   = "local/file.yml"
         env = true
       }

[github-actions]

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