Ruby support

[michelvocks]

Fixes #140

[codecov-io]

Codecov Report

Merging #148 into master will decrease coverage by 0.03%.
The diff coverage is 67.28%.

@@            Coverage Diff            @@
##           master    #148      +/-   ##
=========================================
- Coverage   65.84%   65.8%   -0.04%     
=========================================
  Files          25      27       +2     
  Lines        2219    2354     +135     
=========================================
+ Hits         1461    1549      +88     
- Misses        589     618      +29     
- Partials      169     187      +18

Impacted Files	Coverage Δ
plugin/plugin.go	66.93% <ø> (ø)	⬆️
workers/scheduler/scheduler.go	68.54% <ø> (-1.67%)	⬇️
workers/pipeline/ticker.go	36.5% <0%> (-0.59%)	⬇️
workers/pipeline/pipeline.go	95.38% <100%> (+2.47%)	⬆️
workers/pipeline/update_pipeline.go	52.5% <47.05%> (-4.03%)	⬇️
workers/pipeline/build_ruby.go	67.08% <67.08%> (ø)
workers/scheduler/create_cmd.go	73.77% <73.77%> (ø)

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[michelvocks]

@Skarlso This ready for review.

Documentation: gaia-pipeline/docs#9
Ruby example pipeline: https://github.com/gaia-pipeline/ruby-example

[Skarlso]

@michelvocks Ack. I'll give this a spin today. :)

[Skarlso]

@michelvocks is the go.mod file update intentional?

[Skarlso]

Huh? :O

[michelvocks]

This has been auto corrected by goimports. Shouldn't be a problem in my opinion.

[michelvocks]

@michelvocks is the go.mod file update intentional?

Nope. No clue what is going on there. It has been magically added by go modules.

[michelvocks]

@Skarlso I think the problem is golang/go#27643

I didn't know that go get will force go mod to automatically add it as dependency.
I've removed all indirect dependencies.

[Skarlso]

I played around with this yesterday for a while. Looks good. I had some initial trouble getting bundler to work. I wonder if we should add --vendor into the doc. But I guess however is using Ruby probably already knows these tricks.

I have one last go on the code today then it's good to merge.

[michelvocks]

@Skarlso I've implemented the fix and added documentation for the special constraints.

[Skarlso]

@michelvocks Do you need the name thingy for this in this? Or can we close this? It should be working. :)

[michelvocks]

@michelvocks Do you need the name thingy for this in this? Or can we close this? It should be working. :)

@Skarlso It's implemented. That is what I meant with my last reply. 😄
In my opinion this is ready for merge if you agree?

[Skarlso]

@michelvocks Haha yes. I'm an idiot. Sorry. :) Go ahead. :)