Clarify Spring Native AOT Gradle Plugin repository documentation

[itsandreramon]

I added every dependency as described here: https://docs.spring.io/spring-native/docs/current/reference/htmlsingle/#_sample_project_setup

What am I doing wrong?

* Exception is:
org.gradle.api.plugins.UnknownPluginException: Plugin [id: 'org.springframework.experimental.aot', version: '0.9.0-SNAPSHOT'] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact 'org.springframework.experimental.aot:org.springframework.experimental.aot.gradle.plugin:0.9.0-SNAPSHOT')
  Searched in the following repositories:
    Gradle Central Plugin Repository

[MarcelCoding]

You forgot the spring snapshot repository: https://docs.spring.io/spring-native/docs/current/reference/htmlsingle/#_maven_repository

[itsandreramon]

I added it, as stated in the docs

[itsandreramon]

Fixed: The docs forgot to state that you need to add the m2 repo as well when defining the snapshot plugin repository otherwise the dependency-management artifact cannot be found.

pluginManagement {
    repositories {
        gradlePluginPortal() // this needs to be added as well, otherwise other dependencies don't resolve
        maven { url 'https://repo.spring.io/snapshot' }
    }
}