Add build_command to script/commands

[jmthomas]

closes #688

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (aa0bd75) 70.82% compared to head (5f8d675) 70.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #691      +/-   ##
==========================================
+ Coverage   70.82%   70.84%   +0.02%     
==========================================
  Files         471      471              
  Lines       30233    30236       +3     
  Branches      822      822              
==========================================
+ Hits        21412    21421       +9     
+ Misses       8737     8730       -7     
- Partials       84       85       +1     

Flag	Coverage Δ
frontend	58.65% <ø> (-0.05%)	⬇️
ruby-backend	78.20% <100.00%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
openc3/lib/openc3/api/cmd_api.rb	99.00% <100.00%> (+0.99%)	⬆️
openc3/lib/openc3/script/commands.rb	98.96% <100.00%> (+6.41%)	⬆️
openc3/lib/openc3/version.rb	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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