It is a bit outdated but you may find this useful
The recently introduced vscode click-button sysimage build is super useful (for me) so the video should be updated…
https://www.julia-vscode.org/docs/dev/userguide/compilesysimage/
Mind the very last sentence of this page which took me some time to consider:
This requires the `useCustomSysimage` field to be set to `true` in the application settings of the extension."
Note that the video use Linux and PkgSkeleton which are of course options…