cmd: add "archName" to gen-manifests mock dnf solver URLs

This commit adds the manifest name to the mock depsolve URL output
so that we can test for it from inside otk. This will help with
issues like https://github.com/osbuild/otk/pull/255/files#r1782953752

cmd/gen-manifests/main.go

@@ -416,7 +416,7 @@ func mockDepsolve(packageSets map[string][]rpmmd.PackageSet, repos []rpmmd.RepoC
 				panic(err)
 			}
 			url.Host = "example.com"
-			url.Path = "pseudo-repo-pkg:" + url.Path
+			url.Path = fmt.Sprintf("passed-arch:%s/passed-repo:%s", archName, url.Path)
 			specSet = append(specSet, rpmmd.PackageSpec{
 				Name:           url.String(),
 				RemoteLocation: url.String(),