add new py-dev Docker stage and use in all later stages
#681
| Job | Run time |
|---|---|
| 15s | |
| 1m 29s | |
| 1m 44s |
py-dev Docker stage and use in all later stages
#681
| Job | Run time |
|---|---|
| 15s | |
| 1m 29s | |
| 1m 44s |