* Make validate-schema CLI command work vs. disk Previously, `grafana-cli cue validate-schema` would only validate the CUE files that had been included at compile time. Now, the command requires passing a grafana checkout root path, and will actually check against live files on disk. * Exempt validateScuemata from sec linter * Nit: validateScuemata is a simpler, better name * Try to fix validate-scuemata build step