Make roxie go gettable

```go
 go install github.com/stackrox/roxie/cmd@latest
```

Installs roxie but as cmd not `roxie` but dropping cmd causes failures :( 

```go
go install github.com/stackrox/roxie@latest
go: github.com/stackrox/roxie@latest: module github.com/stackrox/roxie@latest found (v0.4.1), but does not contain package github.com/stackrox/roxie
```