Hi @mfoglio,
Looks like the dockerfile you wrote also expects a manual input:
There are 3 choices for the alternative python3 (providing /usr/bin/python3).
Selection Path Priority Status
0 /usr/bin/python3.8 3 auto mode
1 /usr/bin/python3.6 1 manual mode
2 /usr/bin/python3.6m 2 manual mode
3 /usr/bin/python3.8 3 manual mode
Press to keep the current choice[*], or type selection number:
Can you please try the steps suggested manually without a dockerfile?
Please let me know what happens.