distro/rhel8: label the build root

We require the right SELinux labels to be set on some of the tools we
use, make sure the policy is installed and the labels applied in the
buildroot, in the same way as in the target image.

Signed-off-by: Tom Gundersen <teg@jklm.no>

internal/distro/rhel8/distro.go

@@ -304,6 +304,7 @@ func (t *imageType) pipeline(c *blueprint.Customizations, options distro.ImageOp
 func (t *imageType) buildPipeline(repos []rpmmd.RepoConfig, arch architecture, buildPackageSpecs []rpmmd.PackageSpec) *osbuild.Pipeline {
 	p := &osbuild.Pipeline{}
 	p.AddStage(osbuild.NewRPMStage(t.rpmStageOptions(arch, repos, buildPackageSpecs)))
+	p.AddStage(osbuild.NewSELinuxStage(t.selinuxStageOptions()))
 	return p
 }
 
@@ -865,6 +866,7 @@ func New() distro.Distro {
 			"policycoreutils",
 			"python36",
 			"qemu-img",
+			"selinux-policy-targeted",
 			"systemd",
 			"tar",
 			"xfsprogs",