installation_proxy: make sure /PublicStaging exists on device
#4070
| Job | Run time |
|---|---|
| 1m 22s | |
| 1m 26s | |
| 2m 57s | |
| 1m 18s | |
| 1m 17s | |
| 3m 29s | |
| 1m 19s | |
| 1m 39s | |
| 3m 7s | |
| 1m 21s | |
| 1m 2s | |
| 3m 14s | |
| 1m 38s | |
| 2m 2s | |
| 5m 9s | |
| 32m 20s |