Add a HTTPS proxy for concourse on GCP

[calj]

No description provided.

[codecov-io]

Codecov Report

Merging #62 into master will decrease coverage by 2.8%.
The diff coverage is 16.23%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   45.86%   43.05%   -2.81%     
==========================================
  Files          16       16              
  Lines         290      353      +63     
==========================================
+ Hits          133      152      +19     
- Misses        157      201      +44

Impacted Files	Coverage Δ
tpl/gcp/deployments/ingress/ingress.yml.erb	0% <0%> (ø)
lib/kite/render.rb	90% <82.6%> (-2.86%)	⬇️

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