PR pipelines to run helmfile diff

[jstrachan]

it would be awesome if PRs on a helmfile based environment git repository would run helmfile diff and post the results to the PR as a comment. Then folks could see the effect of PRs before merge

[vbehar]

FYI in our current setup based on helmfile, we are running the following steps for each PR:

• helmfile deps
• helmfile lint --skip-deps
• helmfile diff --skip-deps --suppress-secrets
• helmfile template --skip-deps | kubectl apply --dry-run -f -

[jstrachan]

logging the diff in the master pipeline would be handy too for diagnostics

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/lifecycle stale

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/lifecycle rotten

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@jenkins-x-bot: Closing this issue.

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