Add cookiecutter variables in project to be able to easily rebuild

worker-{{cookiecutter.slug}}/.cookiecutter.json

+{
+  "slug": "{{ cookiecutter.slug }}",
+  "name": "{{ cookiecutter.name }}",
+  "description": "{{ cookiecutter.description }}",
+  "worker_type": "{{ cookiecutter.worker_type }}",
+  "author": "{{ cookiecutter.author }}",
+  "email": "{{ cookiecutter.email}}"
+}