p4o won't run due to missing package

In the open-p4studio and sde containers, p4o won't run because aspell is missing.

root@ca754a328fc9:/open-p4studio# p4obfuscator 
/bin/sh: 1: aspell: not found
Uncaught exception:
  
  Util.Shell.Failure(_)

Raised at file "util/shell.ml", line 11, characters 15-32
Called from file "smith/words.ml", line 109, characters 4-86