app: tell the user to use -vv when debugging "manifest --validate"
#773
| Job | Run time |
|---|---|
| 2m 36s | |
| 2m 37s | |
| 2m 25s | |
| 2m 39s | |
| 2m 3s | |
| 1m 49s | |
| 5m 19s | |
| 5m 23s | |
| 5m 20s | |
| 30m 11s |
-vv when debugging "manifest --validate"
#773
| Job | Run time |
|---|---|
| 2m 36s | |
| 2m 37s | |
| 2m 25s | |
| 2m 39s | |
| 2m 3s | |
| 1m 49s | |
| 5m 19s | |
| 5m 23s | |
| 5m 20s | |
| 30m 11s |