update xtask README.md with helpful developer docs #307
| Job | Run time |
|---|---|
| 19s | |
| 3s | |
| 11s | |
| 3m 28s | |
| 5m 23s | |
| 7m 4s | |
| 4m 56s | |
| 4m 28s | |
| 3m 50s | |
| 3m 57s | |
| 4m 15s | |
| 4m 40s | |
| 3m 45s | |
| 5m 1s | |
| 8s | |
| 13s | |
| 16s | |
| 12s | |
| 29s | |
| 33s | |
| 28s | |
| 22s | |
| 36s | |
| 27s | |
| 29s | |
| 28s | |
| 22s | |
| 28s | |
| 28s | |
| 39s | |
| 22s | |
| 23s | |
| 22s | |
| 37s | |
| 24s | |
| 35s | |
| 11s | |
| 30s | |
| 3s | |
| 1h 1m 25s |