Jdm/stack healthcheck marshaling

[jmacelroy]

Fixes #1974

I've attempted to swap out the regex and manual parsing of the curl healthchecks for stack manifests. This works on the existing test cases. I added another set of test cases that is closer to this logic and doesn't use the yaml parsing sections. If we like this I'm going to go back through and make sure I test all the known edge cases in both spots.

[derek]

Thank you for your contribution. unfortunately, one or more of your commits are missing the required "Signed-off-by:" statement. Signing off is part of the Developer Certificate of Origin (DCO) which is used by this project.

Read the DCO and project contributing guide carefully, and amend your commits using the git CLI. Note that this does not require any cryptography, keys or special steps to be taken.

💡 Shall we fix this?

This will only take a few moments.

First, clone your fork and checkout this branch using the git CLI.

Next, set up your real name and email address:

git config --global user.name "Your Full Name"
git config --global user.email "you@domain.com"

Finally, run one of these commands to add the "Signed-off-by" line to your commits.

If you only have one commit so far then run: git commit --amend --signoff and then git push --force.
If you have multiple commits, watch this video.

Check that the message has been added properly by running "git log".

[codecov]

Codecov Report

Merging #1975 (b531b69) into master (f5de696) will decrease coverage by 0.02%.
The diff coverage is 71.87%.

@@            Coverage Diff             @@
##           master    #1975      +/-   ##
==========================================
- Coverage   33.31%   33.28%   -0.03%     
==========================================
  Files         125      125              
  Lines       13935    13937       +2     
==========================================
- Hits         4642     4639       -3     
- Misses       8791     8794       +3     
- Partials      502      504       +2     

Impacted Files	Coverage Δ
pkg/model/stack_serializer.go	65.03% <71.87%> (-0.53%)	⬇️

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