dev_install.md should mention yarn 4

[fm3]

context: https://scm.slack.com/archives/C5AKLAV0B/p1726041769346569

how to install yarn 4 on ubuntu, MacOS?

[hotzenklotz]

Yarn get's installed by NodeJS (or rather the NodeJS core package corepack) automatically. See: https://github.com/scalableminds/webknossos/blob/master/DEV_INSTALL.md#nodejs--yarn

There are no other install steps required.

[fm3]

Ah I see, thanks! I’ll have a look at how to do that exactly for ubuntu, and add that in the Ubuntu block. Maybe you could do the same for the MacOS block? (Or is it already included?)

[hotzenklotz]

I updated the docs for MacOS in PR #8309.

The Linux steps should be identical. However, depending on your Linux distribution and how they build the nodejs package, corepack might not be shipped with the default node package...
See this separate Ubuntu package: https://launchpad.net/ubuntu/oracular/+package/node-corepack

[fm3]

Thanks! I’ll try this with ubuntu 22.04, which is what the file explicitly supports. Users of other linux distributions will hopefully get a readable error and then have a look themselves for how to install corepack