Use dune-release publish distrib in CONTRIBUTING.md (#825)
#628
| Job | Run time |
|---|---|
| 22m 50s | |
| 10m 43s | |
| 23m 32s | |
| 22m 22s | |
| 8m 54s | |
| 8m 23s | |
| 8m 18s | |
| 10m 50s | |
| 1h 55m 52s |