[BugFix: Issue #338] Skip docker login from forks

[dikhan]

What problem does this Pull Request solve?

Follow-up fix for #337

• Travis does not allow secret env variables to be used in forks which results into all the PRs opened by external contributors to fail. By adding this docker logins will not be executed and therefore builds now may still fail due to docker free quota being reached (since the egres ip from travis is shared among all the hosts). This is preferable as at least there is a change that the build will pass, unfortunately Travis does not provide any solution for this at the moment.

Soure: https://docs.travis-ci.com/user/environment-variables/

Please link to the issue number here (issue will be closed when PR is merged): Closes #338

If you don't have an issue created, please create the issue first describing the problem and then open the PR

Type of change

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• New feature (change that adds new functionality)
• Bug-fix (change that fixes current functionality)
• Tech debt (enhances the current functionality)
• New release (pumps the version)

Checklist

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• I have read and followed the CONTRIBUTING guidelines
• I have added tests that prove my fix is effective or that my feature works
• I have made sure code compiles correctly and all tests are passing by running make test-all
• I have added/updated necessary documentation (if appropriate)
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  • Feature Request: PRs related to feature requests should have in the title [FeatureRequest: Issue #X] <PR Title>
  • Bug Fixes: PRs related to bug fixes should have in the title [BugFix: Issue #X] <PR Title>
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Checklist for Admins

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[codecov]

Codecov Report

Merging #339 (50d0e52) into master (b648612) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #339   +/-   ##
=======================================
  Coverage   93.66%   93.66%           
=======================================
  Files          60       60           
  Lines        3584     3584           
=======================================
  Hits         3357     3357           
  Misses        160      160           
  Partials       67       67           

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