Do not generate dokka for snapshots and EAPs (#4985)

Author: osipxd

build-logic/src/main/kotlin/ktorbuild.dokka.gradle.kts

@@ -28,6 +28,11 @@ dokka {
 }
 
 tasks.withType<DokkaGeneratePublicationTask>().configureEach {
+    // Generate Dokka only for stable releases 'X.Y.Z' to save time when building snapshots, EAPs, etc.
+    // Comment these lines if you want to test Dokka generation locally
+    val projectVersion = project.version.toString()
+    onlyIf { isStableVersion(projectVersion) }
+
     // Reduce memory consumption on CI
     if (ktorBuild.isCI.get()) {
         withLimitedParallelism("dokka", maxParallelTasks = 2)

build-logic/src/main/kotlin/ktorbuild/internal/Version.kt

@@ -24,3 +24,8 @@ internal fun Project.resolveVersion(): String {
         else -> projectVersion
     }
 }
+
+private val stableVersionRegex = Regex("""^\d+\.\d+\.\d+$""")
+
+/** Checks whether the given [version] stable or not. */
+internal fun isStableVersion(version: String) = version matches stableVersionRegex