I need manage.py, but not even django not found on container. Installed with dokku 0.8

It seems like you’re trying to access manage.py from the root of the filesystem. Dokku has most likely placed your application’s files somewhere else. Assuming that the path /var/lib/herokuish/buildpacks/buildpack-python/tests/python-django/requirements.txt is on the container, manage.py should also be in the same directory. So, you will need to go to that directory first:

cd /var/lib/herokuish/buildpacks/buildpack-python/tests/python-django/

and then run manage.py:

python manage.py db init