docs(gradle): Add descriptions to tasks so they show up without --all

Signed-off-by: Sebastian Schuberth <sebastian@doubleopen.org>

build.gradle.kts

@@ -93,6 +93,9 @@ tasks.named<DependencyUpdatesTask>("dependencyUpdates") {
 // all dependencies at once is beneficial, e.g. for debugging version conflict resolution.
 // [1]: https://docs.gradle.org/current/userguide/viewing_debugging_dependencies.html#sec:listing_dependencies
 tasks.register("allDependencies") {
+    group = "Help"
+    description = "Displays all dependencies declared in all projects."
+
     val dependenciesTasks = getTasksByName("dependencies", /* recursive = */ true).sorted()
     dependsOn(dependenciesTasks)
 

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

@@ -164,6 +164,9 @@ tasks.withType<Detekt>().configureEach detekt@{
 }
 
 tasks.register("detektAll") {
+    group = "Verification"
+    description = "Run all detekt tasks with and without type resolution."
+
     dependsOn(tasks.withType<Detekt>())
 }