manifest: add shadow-utils and pam when users are created

org.osbuild.users runs useradd, usermod, passwd, and mkhomedir_helper in
the os tree using chroot. Most image types should already have the
required packages, but some minimal image types, like 'tar' don't, so
let's add them for the stage to run and to enable user management in the
image.

pkg/manifest/os.go

@@ -246,6 +246,16 @@ func (p *OS) getPackageSetChain(Distro) []rpmmd.PackageSet {
 		}
 	}
 
+	if len(p.Users) > 0 {
+		// org.osbuild.users runs useradd, usermod, passwd, and
+		// mkhomedir_helper in the os tree using chroot. Most image types
+		// should already have the required packages, but some minimal image
+		// types, like 'tar' don't, so let's add them for the stage to run and
+		// to enable user management in the image.
+		packages = append(packages, "shadow-utils", "pam")
+
+	}
+
 	osRepos := append(p.repos, p.ExtraBaseRepos...)
 
 	chain := []rpmmd.PackageSet{