snapcraft.yaml: add PYTHONPATH to environment

Required to pickup the germinate stage-package

Signed-off-by: Dilyn Corner <[email protected]>

snapcraft.yaml

@@ -15,6 +15,7 @@ environment:
   FAKEROOT_FLAGS: "--lib $SNAP/usr/lib/lib-arch/libfakeroot/libfakeroot-tcp.so --faked $SNAP/usr/bin/faked-tcp"
   PATH: $SNAP/usr/bin:$SNAP/bin:$SNAP/sbin:$PATH
   GCONV_PATH: /snap/core20/current/usr/lib/$SNAPCRAFT_ARCH_TRIPLET/gconv
+  PTYHONPATH: $SNAP/usr/lib/python3/dist-packages:$PYTHONPATH
 
 apps:
   ubuntu-image: