Add custom maven repository for intellij platform dependencies

[mmakos]

Describe the need of your request

With the new IntelliJ Platform Gradle Plugin (2.x), it’s no longer possible to define custom Maven repositories for resolving IntelliJ Platform dependencies unless they are officially declared via the intellijPlatform {} block.

In our environment, we do not have direct access to JetBrains repositories (e.g., https://www.jetbrains.com/intellij-repository/releases). Instead, we proxy them via our internal Maven repository (Artifactory). In plugin version 1.x, this setup worked fine with standard maven {} declarations.

Currently, there is no way to use these mirrored repositories with the new plugin.

Proposed solution

Introduce a method similar to customPluginRepository, for Maven repositories, e.g.:

repositories {
    intellijPlatform {
        customMavenRepository("https://our-internal-maven-repo/artifactory/maven-intellij-dependencies")
        customMavenRepository("https://our-internal-maven-repo/artifactory/maven-jetbrains")
    }
}

This would enable environments behind firewalls or proxies to continue using the plugin without needing direct access to JetBrains infrastructure.

Alternatives you've considered

With version 1.x of the plugin, it was possible to declare:

repositories {
    maven {
        url = "https://our-internal-maven-repo/artifactory/maven-intellij-dependencies"
    }
    maven {
        url = "https://our-internal-maven-repo/artifactory/maven-jetbrains"
    }
}

But these are not picked up by the new plugin 2.x, which now resolves all IntelliJ-related dependencies via intellijPlatform.repositories only.

Additional context

No response

[hsz]

Cześć Michał!

With the IntelliJ Platform Gradle Plugin 2.x release, working with custom repositories is supported even better than previously. The intellijPlatform.releases() repository helper creates a simple Maven repository, pointing to the https://www.jetbrains.com/intellij-repository/releases or https://cache-redirector.jetbrains.com/www.jetbrains.com/intellij-repository/releases URL.

But artifacts from the Maven repositories aren't picked by default anymore as installers are picked by default – see: https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin-dependencies-extension.html#target-versions

The useInstaller = true mode uses a different group:name when declaring a dependency on the IntelliJ Platform, and it doesn't match the ones present in the IntelliJ Platform Maven repositories, which you replicate.
To rely on non-installer archives from the Maven repository (ours or yours), use the useInstaller = false flag.