go(feat): Add the dry-run flag to gomplate (#2301)

[mihkels]

No description provided.

[hairyhenderson]

@mihkels Thanks for working on this, can you give more details on what the goal is here?

In general I'd prefer an issue to be filed first so we can discuss before any time is spent on writing code.

[hairyhenderson]

..a month later, sorry for the oversight, I see that #2301 was indeed filed first. Given there was no discussion on that issue, this PR may have been premature. When I have some time I'll review #2301 to see if that's actually functionality that makes sense.

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