feat: introduce the only.flavor key to allow building of package variants
#1375
| Job | Run time |
|---|---|
| 7m 47s | |
| 7m 47s | |
| 20m 19s | |
| 20m 19s | |
| 21m 4s | |
| 21m 4s | |
| 18m 36s | |
| 18m 36s | |
| 3m 20s | |
| 20m 40s | |
| 2h 39m 32s |