Add 'development' as accepted vaue for WP_AUTO_UPDATE_CORE

[knutsp]

knutsp
The 'beta' and 'rc' strings was added to WP_AUTO_UPDATE_CORE constant. Why was 'nightly' not added, too?

dd32 2020-12-09 05:04
That’s a good question :slightly_smiling_face: The main reasoning I didn’t think of even adding it was because if you install a nightly, it stays on nightly forever, there’s no need to opt-in through the constant.

Beta/RC is more complicated as it’s running stable, but augmenting it with Beta/RCs.

https://core.trac.wordpress.org/changeset/49245/trunk/src/wp-includes/update.php could be added to also allow for development or branch-development for nightly/branch nightlies.

The whitelist for that parameter on the dotorg side is: [ 'beta', 'rc', 'stable', 'development', 'branch-development' ]

​https://wordpress.slack.com/archives/CULBN711P/p1607486676211300

So I propose this to be implemented, at least 'development'. Reasons:

1. Completeness
2. Possibility to run a testing site, running latest development version ("nightly builds"), without the Beta Tester plugin.

[audrasjb]

Moving for 5.7 consideration.

[xkon]

51978.diff​ adds development as an accepted value and adjusts the Site Health test as well.

I believe I didn't miss anything, but if I did feel free to point out and I'll be happy to refresh :).

[audrasjb]

It looks good to me, thank you @xkon!

[afragen]

Were we going to add branch-development too.

[SergeyBiryukov]

In 50082:

Upgrade/Install: Allow WordPress sites to opt-in to development releases.

The WP_AUTO_UPDATE_CORE constant now supports development and branch-development values.

This makes it possible for sites to opt-in to updating to nightly builds without having to install a plugin.

Follow-up to [49245], [49292].

Props xkon, knutsp, afragen, audrasjb, dd32.
Fixes #51978.