Custom gradle plugin - buildscript dependencies

Question

I am trying to write a custom gradle plugin (kotlin/kotlin dsl) that will allow me to set all sorts of things in the build scripts. I would like to add dependencies on build tooling, such as detekt, log4j2, ktlint, and even configure them. So for example, including the plugin will add detekt tasks to the build.

I have a basic binary plugin with a task, but I am having difficulty constructing a good web-search to find what I need. Can anyone please:

• provide some clues
• give me some search terms
• point me at an article
• or point me at a good example?

Thanks in advance.

Phill

Edit: this plugin class compiles, and seems acceptible to the receiving build script, but no detekT tasks appear in the receiving build.

class BuildCommonPlugin: Plugin<Project> {
    override fun apply(project: Project) {
        project.dependencies
           .create("io.gitlab.arturbosch.detekt:1.19.0")
    }
}

EDIT: At the comment I am using a 'buildSrc' type plugin. The irritating thing is that I need to duplicate this in each grade project, and when I find an improvement I need to update them all.

How easy is it to convert a 'buildSrc' into a publishable plugin?