New param --offline-only

[alanhamlett]

To prevent sending any heartbeats to the API and only save to the local offline db.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 62.66%. Comparing base (b8816ca) to head (c448b20).

@@             Coverage Diff             @@
##           develop    #1064      +/-   ##
===========================================
- Coverage    62.69%   62.66%   -0.03%     
===========================================
  Files          382      382              
  Lines        16404    16418      +14     
===========================================
+ Hits         10285    10289       +4     
- Misses        5557     5566       +9     
- Partials       562      563       +1     

Flag	Coverage Δ
unittests	62.66% <40.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
cmd/offline/offline.go	49.66% <ø> (ø)
cmd/params/params.go	85.25% <100.00%> (+0.03%)	⬆️
cmd/root.go	0.00% <0.00%> (ø)
pkg/offline/offline.go	56.57% <50.00%> (+0.16%)	⬆️
cmd/heartbeat/heartbeat.go	75.22% <0.00%> (-1.05%)	⬇️
pkg/heartbeat/heartbeat.go	85.71% <50.00%> (-2.66%)	⬇️
cmd/run.go	42.50% <0.00%> (-0.62%)	⬇️