Add "installing from a nightly release" guide to install section

[samodell]

Describe the change you'd like to see
The install section should include information about installing from the nightly component releases, not just the latest numbered release

[knative-housekeeping-robot]

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Mark the issue as fresh by adding the comment /remove-lifecycle stale.
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/lifecycle stale

[abrennan89]

@samodell this one probably makes sense to do once we have separate install guides for Serving and Eventing.
Maybe add this as a note for #1922 and #1923 so that this comment doesn't get lost if the issue goes stale before these get separated?

I'll add the details about nightly builds to the CLI install docs.

[samodell]

/remove-lifecycle stale

[abrennan89]

@omerbensaadon do you want to take a crack at this one or add it for in the DUX group?

[omerbensaadon]

I'll throw this on the DUX agenda 👍🏼

[abrennan89]

@evankanderson do you know how to do this? This issue has been open forever so I'd like to see us close it, whether that's because we don't intend to doc this or because someone can give me the info 😄

[evankanderson]

I need to look up where the nightly artifacts are stored. Let me do that...

/assign

[abrennan89]

Ehhh I just noticed the docs at https://knative.dev/development/admin/install/serving/install-serving-with-yaml/#install-the-knative-serving-component actually use a URL that points to knative-nightly - have we then been telling people to install the nightly version this whole time, and if so should we not be doing that and be pointing to a stable, released version instead @evankanderson ?

[julz]

the development/ docs (i.e. pre-release from the drop-down) link to the nightly release (since the development docs might refer to features that aren't in the latest stable version), the docs/ docs (v0.24 in the dropdown) link to the current stable release (e.g. https://knative.dev/docs/admin/install/serving/install-serving-with-yaml/#install-the-knative-serving-component).

[julz]

having said that I do still think an explicit "How to install the nightly release" might be useful in docs/, rather than requiring people to know to flip the dropdown to pre-release, iyswim

[evankanderson]

It's possible that kn quickstart might resolve this, but I think it's worth a note somewhere about the availability of the GCS manifests, as that that allows automation to avoid the GitHub API rate limits, which are pretty tight.

[abrennan89]

Closing this since the issue is 2 years old and these docs technically are available on the development version of the site. We can revisit if this or something similar is requested by users in the future.