build: add freebsd and riscv64
#199
| Job | Run time |
|---|---|
| 4m 7s | |
| 5s | |
| 3m 58s | |
| 14m 35s | |
| 7m 46s | |
| 7m 8s | |
| 12m 57s | |
| 9s | |
| 7m 7s | |
| 12m 31s | |
| 6m 44s | |
| 9m 56s | |
| 14m 44s | |
| 6m 51s | |
| 10m 18s | |
| 12m 54s | |
| 6m 42s | |
| 7m 2s | |
| 13m 6s | |
| 0s | |
| 2h 38m 40s |