Update Jenkinsfile to Include Linux Builds

[tilalx]

Updated the Jenkinsfile to include builds on Linux because many users have their controllers on Linux. Additionally, code coverage is now obtained only on Unix systems. For more details, see the buildPlugin.groovy file.

Testing done

No additional tests needed. Pull request will be verified by ci.jenkins.io .

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.50%. Comparing base (220da29) to head (279b53c).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #146   +/-   ##
=========================================
  Coverage     55.50%   55.50%           
  Complexity       73       73           
=========================================
  Files             8        8           
  Lines           481      481           
  Branches         57       57           
=========================================
  Hits            267      267           
  Misses          202      202           
  Partials         12       12           

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