multiple policy blocks in a scaling block should result in an error

[cgbaker]

Nomad version

0.11.0

Issue

the job parser is merging multiple policy blocks in a scaling block. it should probably throw an error in this case. this loop should be replaced by a simple conditional:

nomad/jobspec/parse_group.go

Lines 368 to 378 in 81db9e9

	if o := listVal.Filter("policy"); len(o.Items) > 0 {
	for _, o := range o.Elem().Items {
	var m map[string]interface{}
	if err := hcl.DecodeObject(&m, o.Val); err != nil {
	return err
	}
	if err := mapstructure.WeakDecode(m, &result.Policy); err != nil {
	return err
	}
	}

[github-actions]

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