Handle builds triggered by AWS SDK.

[aiell0]

Introduction

Codebuild can be triggered by webhooks, or by resources inside the AWS cloud environment (such as lambda) via the AWS SDK. Upon triggering builds with the SDK inside Lambda, I was receiving the error documented inside #148. The intent of this PR is to resolve the issue.

Changelog

1. lib/services/codebuild.js
   • Use git to find branch if not triggered by webhooks.
   • Send undefined pull request # if not triggered by webhook.
2. test/services/codebuild.test.js
   • Add tests that mock git functionality.

[codecov]

Codecov Report

Merging #149 into master will increase coverage by 0.31%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
+ Coverage    89.8%   90.11%   +0.31%     
==========================================
  Files          23       23              
  Lines         353      354       +1     
  Branches       85       85              
==========================================
+ Hits          317      319       +2     
+ Misses         36       35       -1

Impacted Files	Coverage Δ
lib/services/codebuild.js	100% <100%> (+5.55%)	⬆️

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[aiell0]

@eddiemoore Can we get this merged?