always use an explicit ubuntu image (Cherry-pick of #21867) (#21868) #25163
| Job | Run time |
|---|---|
| 10s | |
| 14m 42s | |
| 8m 59s | |
| 9m 43s | |
| 13m 41s | |
| 14m 35s | |
| 17m 30s | |
| 8m 43s | |
| 2s | |
| 3m 38s | |
| 17m 24s | |
| 17m 58s | |
| 16m 24s | |
| 17m 40s | |
| 27m 44s | |
| 13m 22s | |
| 10m 7s | |
| 14m 14s | |
| 14m 45s | |
| 10m 37s | |
| 8m 4s | |
| 21m 59s | |
| 1s | |
| 1s | |
| 4h 42m 3s |