feat: add docker and docker-compose support

[sammcj]

• Add the option of building into a container image.
• Add basic docker-compose example.

Fixes #94

[sammcj]

Leaving as a draft for now as the installer fails to install praat-parselmouth without any useful error information:

Failed to install praat-parselmouth. Check AutoDebug output.
319.8 Traceback (most recent call last):
319.8   File "/app/install.py", line 18, in <module>
319.8     ensure_installed()
319.8   File "/app/install.py", line 14, in ensure_installed
319.8     install_requirements()
319.8   File "/app/setup_tools/magicinstaller/magicinstaller.py", line 5, in install_requirements
319.8     requirement.install_or_upgrade_if_needed()
319.8   File "/app/setup_tools/magicinstaller/requirement.py", line 30, in install_or_upgrade_if_needed
319.8     self.post_install(self.install())
319.8   File "/app/setup_tools/magicinstaller/requirement.py", line 36, in post_install
319.8     raise InstallFailException(exit_code, stdout, stderr)
319.8 autodebug.autodebug.InstallFailException: Install failed!

I don't know python well but hey - it's a start.