📖 docs: Add installation guide with homebrew

[ludusrusso]

What this PR does / why we need it:

Add installation guide with homebrew for macOS in book. Related to #2389

Can be merged once Homebrew/homebrew-core/73610 is merged!

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[davideimola]

What about to add a chapter on updating clusterctl with brew?

[ludusrusso]

/check-cla

[fabriziopandini]

/ok-to-test
/hold
for the discussion on #2389

What about to add a chapter on updating clusterctl with brew?

This is a good idea, but IMO this should not go in the quick start. what about having something under tasks? Also, If I'm not wrong, we are also still discussing how to get automatic upgrades of the formula...

[ludusrusso]

/ok-to-test
/hold
for the discussion on #2389

What about to add a chapter on updating clusterctl with brew?

This is a good idea, but IMO this should not go in the quick start. what about having something under tasks? Also, If I'm not wrong, we are also still discussing how to get automatic upgrades of the formula...

I agree with @fabriziopandini! I'll also put this in WIP until we decide the best name for the homebrew formula!

[fabriziopandini]

/milestone v0.4.0

[stmcginnis]

I wonder if we should get rid of the macOS curl instructions. Though no harm really having both options explained.

Looks good to me, but one small typo pointed out.

[ludusrusso]

@stmcginnis thanks for help! brew install clusterctl is also available on linux now, should I add docs also for this in your opinion?

[stmcginnis]

Brew use on Linux still seems relatively low, but I could see it being useful.

Just another thought, but we could have a separate brew tab. Then have Linux, macOS, and Brew specific instructions, since there really isn't any OS-specific difference when using brew to install. Just throwing the idea out there.

[vincepri]

+1 on having a brew tab as an alternative method.

/ok-to-test

[ludusrusso]

@vincepri @stmcginnis what do you think?

[stmcginnis]

Love it!

[ludusrusso]

I think we are ready on this!

[ludusrusso]

/retest

[fabriziopandini]

/lgtm

[vincepri]

/hold cancel

[vincepri]

/approve

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