distro/rhel86: install and enable NetworkManager-cloud-setup

Install the package, enable timer and service and set the correct
env variable via a drop-in to enable the Azure cloud.

internal/distro/rhel86/distro.go

@@ -925,6 +925,8 @@ func newDistro(distroName string) distro.Distro {
 			},
 			EnabledServices: []string{
 				"firewalld",
+				"nm-cloud-setup.service",
+				"nm-cloud-setup.timer",
 				"sshd",
 				"systemd-resolved",
 				"waagent",
@@ -1057,6 +1059,17 @@ func newDistro(distroName string) distro.Distro {
 					),
 				},
 			},
+			SystemdUnit: []*osbuild.SystemdUnitStageOptions{
+				{
+					Unit:   "nm-cloud-setup.service",
+					Dropin: "10-rh-enable-for-azure.conf",
+					Config: osbuild.SystemdServiceUnitDropin{
+						Service: &osbuild.SystemdUnitServiceSection{
+							Environment: "NM_CLOUD_SETUP_AZURE=yes",
+						},
+					},
+				},
+			},
 			DefaultTarget: "multi-user.target",
 		},
 		kernelOptions:       "ro crashkernel=auto console=tty1 console=ttyS0 earlyprintk=ttyS0 rootdelay=300",

internal/distro/rhel86/package_sets.go

@@ -346,6 +346,7 @@ func azureRhuiCommonPackageSet(t *imageType) rpmmd.PackageSet {
 		Include: []string{
 			"@Server",
 			"NetworkManager",
+			"NetworkManager-cloud-setup",
 			"kernel",
 			"kernel-core",
 			"kernel-modules",