Add ability to specify storing path

[anastasiia-bilova]

Can you please provide functionality to specify a path to store a generated image?

[fboaventura]

@anastasiia-bilova It is somewhat dated, but you may use the file_name attribute to the diagram and specify your desired path.

diagram:
  name: Test
  file_name: /home/user/tmp/my_diagram
  format: png
  ...

This will save the file as /home/user/tmp/my_diagram.png.