Is there a recommended approach to share repositories declarations between a multi module project and the included build-logic project? Both for plugins and dependencies. Currently I'm duplicating them in both

settings.gradle.kts

Have another build that provides a settings plugin that sets up the repositories, include that build in the other two and apply the settings plugin.

I just copy paste it. easier than the setting plugin mechanism IMO. can be trivial config if you force yourself to use the conventional un/pw pattern

maven {
    name = "foo"
    setUrl("<https://foo.com>")
    credentials(org.gradle.api.credentials.PasswordCredentials::class)
}

so ~/.gradle/gradle.properties would have

fooUsername=you@company.com
fooPassworld=fooApiToken

then you can ORG_GRALDE_PROJECT_fooUsername etc in your CI jobs.

Having another build do it doesn't work, I think, for

pluginManagement.repositories {}

We do the same as @tony github.com/apollographql/apollo-kotlin/blob/…/settings.gradle.kts#…

Having another build do it doesn't work, I think, for pluginManagement.repositories {}

That depends on whether you need other settings plugins. For project plugins it works. For other settings plugins indeed not as the settings plugin is too late of course.