add spirv-unknown-naga-wgsl target via naga
#488
| Job | Run time |
|---|---|
| 8m 36s | |
| 9m 15s | |
| 6m 28s | |
| 7m 20s | |
| 14m 16s | |
| 17m 11s | |
| 9m 41s | |
| 11m 2s | |
| 21m 22s | |
| 10m 26s | |
| 6m 24s | |
| 1m 22s | |
| 3s | |
| 2h 3m 26s |