manifest/build: pull in tar implicitly

The tar pipeline requires tar, let only that pull it in.

internal/manifest/build.go

@@ -43,7 +43,6 @@ func (p *BuildPipeline) getPackageSetChain() []rpmmd.PackageSet {
 		"selinux-policy-targeted",
 		"coreutils",
 		"systemd",
-		"tar",
 		"xz",
 	}
 

internal/manifest/oci_container.go

@@ -55,3 +55,7 @@ func (p *OCIContainerPipeline) serialize() osbuild2.Pipeline {
 
 	return pipeline
 }
+
+func (p *OCIContainerPipeline) getBuildPackages() []string {
+	return []string{"tar"}
+}

internal/manifest/tar.go

@@ -45,3 +45,7 @@ func (p *TarPipeline) serialize() osbuild2.Pipeline {
 
 	return pipeline
 }
+
+func (p *TarPipeline) getBuildPackages() []string {
+	return []string{"tar"}
+}