add env variable for eks machine type

internal/kubernetes/provisioner/aws/eks/eks.go

@@ -5,6 +5,7 @@ import v1 "k8s.io/api/core/v1"
 // Conf is the EKS cluster config required for the provisioner
 type Conf struct {
 	ClusterName string
+	MachineType string
 }
 
 // AttachEKSEnv adds the relevant EKS env for the provisioner
@@ -14,5 +15,10 @@ func (conf *Conf) AttachEKSEnv(env []v1.EnvVar) []v1.EnvVar {
 		Value: conf.ClusterName,
 	})
 
+	env = append(env, v1.EnvVar{
+		Name:  "EKS_MACHINE_TYPE",
+		Value: conf.MachineType,
+	})
+
 	return env
 }