Applied OPENC3_OPERATOR_HOSTNAME to json_api.rb

[stephen-ritter]

This basically copies the same structure as what is in microservices_controller.rb and allowing the operator hostname to be set through the OPENC3_OPERATOR_HOSTNAME environment variable.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.58%. Comparing base (9a770f6) to head (4ebae23).
Report is 60 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1511      +/-   ##
==========================================
+ Coverage   76.57%   76.58%   +0.01%     
==========================================
  Files         608      608              
  Lines       45385    45385              
  Branches      798      798              
==========================================
+ Hits        34753    34759       +6     
+ Misses      10544    10538       -6     
  Partials       88       88              

Flag	Coverage Δ
frontend	55.80% <ø> (-0.02%)	⬇️
python	84.24% <ø> (+0.05%)	⬆️
ruby-api	49.00% <ø> (ø)
ruby-backend	82.29% <ø> (ø)

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