ssh-key: use u64 type for certificate timestamps
#486
| Job | Run time |
|---|---|
| 32s | |
| 1m 35s | |
| 13s | |
| 2m 20s |
u64 type for certificate timestamps
#486
| Job | Run time |
|---|---|
| 32s | |
| 1m 35s | |
| 13s | |
| 2m 20s |