add spirv-unknown-naga-wgsl target via naga
#492
| Job | Run time |
|---|---|
| 19m 28s | |
| 10m 15s | |
| 6m 16s | |
| 53s | |
| 9m 43s | |
| 9m 39s | |
| 18m 33s | |
| 8m 17s | |
| 9m 26s | |
| 4m 28s | |
| 7m 22s | |
| 14m 28s | |
| 7m 17s | |
| 4s | |
| 2h 6m 9s |