Path doesn't expand parameter

[camlafit]

Hello

I've tried to set a file with parameter value without success.
For exemple with :

params:
  home: /var/www/discourse
  - file:
     path: $home/bin/script
     chmod: +x
     contents: |
       #!/bin/bash
       echo "I'm a script"

pups doesn't expand $home and can't create /var/www/discourse/script

My purpose was to mode all paths set in template to parameter and prevent them as hardcoded .

Any idea to workaround about this.