Add JSON formatting check to the add-ign function

[skyblaster]

Fixes #187

[openshift-ci]

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[baude]

@skyblaster if you can fix the test failure, ill review and merge.

[skyblaster]

@baude I'm unfamiliar with these particular tests, and not sure why it's failing, so will have to defer to @ashley-cui

If I download libhvee-0.6.0 or later releases, and run .\winmake.ps1 localtest on my local machine, I see the exact same errors.
If I simply run .\winmake.ps1 binaries, the executables are built without any errors.