[AGE-230] [Bug] Start from code can fail if user has a .dockerignore or Dockerfile

[Mahmoud Mabrouk]

There are cases where the user has already a Dockerfile or .dockerignore file in their code folder. In these cases, we current overwrite their Dockerfile and might use their .dockerignore.

We need to make sure to:

1. Not to overwrite their Dockerfile, but calling our Dockerfile differently
2. Not copy their .dockerignore file if existing

_{From SyncLinear.com | AGE-230}