Task with name 'mergeDiktatReports' not found in root project

Describe the bug

In USVM we use gradle convention plugin (buildSrc) to share build logic. When we include Diktat gradle plugin into usvm.kotlin-conventions.gradle.kts, the build fails with the exception.

Expected behavior

The build succeeds.

Observed behavior

FAILURE: Build failed with an exception.

* Where:
Build file '/Users/sergey/Programming/Work/usvm/usvm-core/build.gradle.kts' line: 1

* What went wrong:
An exception occurred applying plugin request [id: 'usvm.kotlin-conventions']
> Failed to apply plugin 'com.saveourtool.diktat'.
   > Task with name 'mergeDiktatReports' not found in root project 'usvm'.

Steps to Reproduce

Project structure:

buildSrc/
    src/main/kotlin/
        usvm.kotlin-conventions.gradle.kts
    build.gradle.kts
usvm-core/
    src/
    build.gradle.kts
gradle/
settings.gradle.kts
diktat-analysis.yml
gradle.properties
gradlew
gradlew.bat

buildSrc/build.gradle.kts

plugins {
    `kotlin-dsl`
}

repositories {
    mavenCentral()
    gradlePluginPortal()
}

val kotlinVersion = "1.9.23"
val diktatVersion = "2.0.0"

dependencies {
    implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
    implementation("com.saveourtool.diktat:diktat-gradle-plugin:$diktatVersion")
}

buildSrc/src/main/kotlin/usvm.kotlin-conventions.gradle.kts

plugins {
    kotlin("jvm")
    `java-library`
    `maven-publish`
    id("com.saveourtool.diktat")
}
// ...

usvm-core/build.gradle.kts

plugins {
    id("usvm.kotlin-conventions")
}

Environment information

diktat version: 2.0.0
build tool: gradle
how is diktat run: plugin
link: USVM

Extra

Brief investigation led to this snippet:

https://github.com/saveourtool/diktat/blob/8d61ddf58e60519830f64ee7d52f144e5da4d57d/diktat-gradle-plugin/src/main/kotlin/com/saveourtool/diktat/plugin/gradle/tasks/SarifReportMergeTask.kt#L92-L98

Looks like we won't register any task if there are no top-level build.gradle.kts.

Adding build.gradle.kts only with

plugins {
    id("com.saveourtool.diktat")
}

solves the problem.

saveourtool / diktat