chore(ci): remove check against source tree from CodeBuild buildspec (#671)

CodePipeline downloads the source as a zip from the source provider rather than doing a Git clone.
This means the .git folder won't be retained and git commands won't work in CodeBuild

Author: shivlaks

buildspec.yaml

@@ -13,7 +13,6 @@ phases:
   post_build:
     commands:
       - "[ -f .BUILD_COMPLETED ] && /bin/bash ./pack.sh"
-      - git diff-index --exit-code --ignore-space-at-eol --stat HEAD
 artifacts:
   files:
     - "**/*"