Add check to verfiy that PR has not more than a single commit

[pmacik]

Signed-off-by: Pavel Macík pavel.macik@gmail.com

Changes

Currently, we encourage contributors to keep PRs with a single commit. For instance:

• Make sure to return nil value when there was an error #1079 (review)
• Use $scenario_id in acceptance tests when possible #1074 (review)
• Update Readme with spec alignment #1064 (review)
• ...

This PR:

• Introduces a simple PR check to verify automatically that a PR does not have more than 1 commit.

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs
  included if any changes are user facing
• Tests
  included if any functionality added or changed. For bugfixes please include tests that can catch regressions
• Follows the commit message standard

[openshift-ci]

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[codecov]

Codecov Report

Merging #1120 (eec5246) into master (31151ab) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1120   +/-   ##
=======================================
  Coverage   58.92%   58.92%           
=======================================
  Files          30       30           
  Lines        1670     1670           
=======================================
  Hits          984      984           
  Misses        560      560           
  Partials      126      126           

---

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[baijum]

/lgtm