build: migrate deprecated gradle features (#663)

Signed-off-by: Jakob Steiner <jakob.steiner@glasskube.eu>

Author: kosmoz

operator/build.gradle.kts

@@ -1,3 +1,4 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import org.springframework.boot.gradle.tasks.bundling.BootBuildImage
 
@@ -38,10 +39,10 @@ java {
 }
 
 tasks.withType<KotlinCompile> {
-    kotlinOptions {
-        jvmTarget = "${JavaVersion.VERSION_17}"
-        javaParameters = true
-        freeCompilerArgs = listOf("-Xjsr305=strict")
+    compilerOptions {
+        jvmTarget.set(JvmTarget.JVM_17)
+        javaParameters.set(true)
+        freeCompilerArgs.set(listOf("-Xjsr305=strict"))
     }
 }
 
@@ -80,11 +81,15 @@ gitProperties {
     dotGitDirectory = rootProject.layout.projectDirectory.dir(".git")
 }
 
-tasks.create("clearCrd", Delete::class) {
+tasks.register("clearCrd", Delete::class) {
+    group = "build"
+    description = "Clears the CRD directory before copy"
     delete = setOf("../deploy/crd")
 }
 
-tasks.create("copyCrd", Copy::class) {
+tasks.register("copyCrd", Copy::class) {
+    group = "build"
+    description = "Copies the CRD YAML files generated by the fabric8 generator"
     dependsOn("kaptKotlin")
     dependsOn("clearCrd")
     from("build/tmp/kapt3/classes/main/META-INF/fabric8") {
@@ -95,8 +100,9 @@ tasks.create("copyCrd", Copy::class) {
 
 tasks.findByName("classes")!!.dependsOn("copyCrd")
 
-tasks.create("installCrd", Exec::class) {
+tasks.register("installCrd", Exec::class) {
     group = "kubernetes"
+    description = "Installs the CRD into the cluster defined in current kubeconfig"
     dependsOn("copyCrd")
     commandLine(
         "kubectl",
@@ -106,8 +112,9 @@ tasks.create("installCrd", Exec::class) {
     )
 }
 
-tasks.create("loadImage", Exec::class) {
+tasks.register("loadImage", Exec::class) {
     group = "kubernetes"
+    description = "Loads the locally built container image into the minikube daemon"
     dependsOn("bootBuildImage")
     commandLine(
         "minikube",