Fix docker compose startup on windows by adding split flag

[TimHi]

As written in #88 passing mulitple arguments to manage.py causes docker compose to fail on windows.
Passing the -S flag allows parsing of multiple arguments, from env man:

 -S/--split-string usage in scripts
      The -S option allows specifying multiple parameters in a script.
      Running a script named 1.pl containing the following first line:

             #!/usr/bin/env -S perl -w -T
             ...

      Will execute perl -w -T 1.pl .

      Without the '-S' parameter the script will likely fail with:

             /usr/bin/env: 'perl -w -T': No such file or directory

[sirodoht]

Hey, that looks great! Thanks for submitting!