Skip auto updates for brew install/upgrade/tap

I think we've all been there. You're right in the middle of something, you need to brew install a formula, you go to install the formula, and then all of a sudden you're greeted with:

Running `brew update --auto-update`...

and so now you have to wait for all of your formulae to update, just so you can use the one that you need.

Well, if you're in a rush or on a slow internet connection, you can skip the auto update by setting the env var HOMEBREW_NO_AUTO_UPDATE to 1.

HOMEBREW_NO_AUTO_UPDATE=1 brew install <formula>

You might find it helpful to throw this into an alias so that you can brew install without updates when you're in a rush, without needing to remember the name of the env var.

From the official docs:

HOMEBREW_NO_AUTO_UPDATE:
If set, Homebrew will not auto-update before running brew install, brew upgrade or brew tap.

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