[geedeecee] improve handling of build-context files, and build-avoidance, and remove old code

gradle-plugins/docker-compose/build.gradle.kts

@@ -1,31 +1,13 @@
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-
 plugins {
   id("kafkatorio.conventions.kotlin-dsl")
-//  kotlin("jvm") version embeddedKotlinVersion
-//  `kotlin-dsl`
   `java-gradle-plugin`
 }
 
-val gradleJvmTarget = "11"
-
 dependencies {
   implementation(platform(libs.kotlin.bom))
   implementation("org.jetbrains.kotlin:kotlin-compiler-embeddable")
 }
 
-//kotlin {
-//  jvmToolchain {
-//    (this as JavaToolchainSpec).languageVersion.set(JavaLanguageVersion.of(gradleJvmTarget))
-//  }
-//}
-//
-//tasks.withType<KotlinCompile>().configureEach {
-//  kotlinOptions {
-//    jvmTarget = gradleJvmTarget
-//  }
-//}
-
 gradlePlugin {
   plugins {
     create("geedeecee") {