add new py-dev Docker stage and use in all later stages
#682
| Job | Run time |
|---|---|
| 19s | |
| 1m 45s | |
| 2m 4s |
py-dev Docker stage and use in all later stages
#682
| Job | Run time |
|---|---|
| 19s | |
| 1m 45s | |
| 2m 4s |