Add Nomad provider

I modeled it off the Kubernetes provider a bit. It supports setting task
config at group and task levels using services and meta attributes.

internal/model/provider_nomad.go

@@ -0,0 +1,28 @@
+package model
+
+import (
+	"github.com/crazy-max/diun/v4/pkg/utl"
+)
+
+// PrdNomad holds nomad provider configuration
+type PrdNomad struct {
+	Address        string `yaml:"address" json:"address,omitempty" validate:"omitempty"`
+	Region         string `yaml:"region,omitempty" json:"region,omitempty" validate:"omitempty"`
+	SecretID       string `yaml:"secretID,omitempty" json:"secretID,omitempty" validate:"omitempty"`
+	Namespace      string `yaml:"namespace,omitempty" json:"namespace,omitempty" validate:"omitempty"`
+	TLSInsecure    *bool  `yaml:"tlsInsecure" json:"tlsInsecure,omitempty" validate:"required"`
+	WatchByDefault *bool  `yaml:"watchByDefault" json:"watchByDefault,omitempty" validate:"required"`
+}
+
+// GetDefaults gets the default values
+func (s *PrdNomad) GetDefaults() *PrdNomad {
+	n := &PrdNomad{}
+	n.SetDefaults()
+	return n
+}
+
+// SetDefaults sets the default values
+func (s *PrdNomad) SetDefaults() {
+	s.TLSInsecure = utl.NewFalse()
+	s.WatchByDefault = utl.NewFalse()
+}

internal/model/providers.go

@@ -7,6 +7,7 @@ type Providers struct {
 	Kubernetes *PrdKubernetes `yaml:"kubernetes,omitempty" json:"kubernetes,omitempty" label:"allowEmpty" file:"allowEmpty"`
 	File       *PrdFile       `yaml:"file,omitempty" json:"file,omitempty"`
 	Dockerfile *PrdDockerfile `yaml:"dockerfile,omitempty" json:"dockerfile,omitempty"`
+	Nomad      *PrdNomad      `yaml:"nomad,omitempty" json:"nomad,omitempty" label:"allowEmpty" file:"allowEmpty"`
 }
 
 // GetDefaults gets the default values