Renamed --file to --playbook

[bessarabov]

This is a matter of taste, but I think that this change makes the project a bit better.

Here is the currect interface of spot:

$ spot_0_7_2 --help
simplotask v0.7.2-7ad5d3d-2023-05-01T08:54:45Z
Usage:
  spot_0_7_2

Application Options:
  -p, --file=           playbook file (default: spot.yml) [$SPOT_FILE]
...
      --inventory-file= inventory file [$SPOT_INVENTORY]
...

Here I did the changes

• --file => --playbook. This make long option playbook consistent with the short option p
• $SPOT_FILE => $SPOT_PLAYBOOK. This makes it play well with the other env variable $SPOT_INVENTORY

[bessarabov]

Hmm. Not sure that I understand why the CI failed.

[bessarabov]

I did a force push to my branch (no changes to the code, but some changes in metadata of the commit) to re-run the CI. And now the CI passed all the steps without the erros.

I don't understand why the first CI run failed ( https://github.com/umputun/simplotask/actions/runs/4851676409 ), but I don't think that this matter much.

[umputun]

Can you pls rebase with the current master and resolve the conflict?

[bessarabov]

I see that you have changed the name of the repo from simplotask to spot (and I"m very happy with this change), so I've deleted my existing fork bessarabov/simplotask to create new fork bessarabov/spot. But the deletion of my fork lead to the auto close of this PR.

The new PR on this topic is #38