Set PYTHONPATH=. during "just test"

This is required in order to find the sawtooth_validator python package
while running the tests.

Signed-off-by: Shawn T. Amundson <amundson@bitwise.io>

Author: vaporos

justfile

@@ -107,6 +107,7 @@ test:
             echo "\033[1m$cmd\033[0m"
             $cmd
             cmd="cd $crate && cargo test $feature"
+            export PYTHONPATH=.
             echo "\033[1m$cmd\033[0m"
             (eval $cmd)
         done