[PFE] Starting CI

[junaruga]

Propose for enhancement.

I want to add Travis CI test for this repository .

As first step, only to verify the all the existing recipe files's style format.

The CI can be on Travis CI + Fedora Docker + rpm-list-builder.
The entire concept is something like below picture.

for recipe in recipe_file_list in the repository:
  for collection_id in the recipe's collection_ids:
    verify command by rpm-list-builder.

As a first way, I tried blow command that I expected that is kind of verify command to only run Recipe#verify. But it needed for the directory to be created.

(venv) $ rpmlb --build dummy ror.yml rh-ror50
...
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/rpmlb-k8dixpt_/001/rh-ror50'

But below command works.

(venv) $ python3 -c 'from rpmlb import recipe
> r = recipe.Recipe("ror.yml", "rh-ror50")
> print(r.verify())
> '
True

This time we can use this logic.
In the future the logic can be run by rpmlb --verify RECIPE_FILE COLLECTION_ID

How do you think?