Fix javadoc attachment

Author: adhesivee

pom.xml

@@ -131,28 +131,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.jetbrains.dokka</groupId>
-                <artifactId>dokka-maven-plugin</artifactId>
-                <version>${dokka.version}</version>
-                <executions>
-                    <execution>
-                        <phase>pre-site</phase>
-                        <goals>
-                            <goal>dokka</goal>
-                        </goals>
-                    </execution>
-                </executions>
-                <configuration>
-                    <dokkaPlugins>
-                        <plugin>
-                            <groupId>org.jetbrains.dokka</groupId>
-                            <artifactId>kotlin-as-java-plugin</artifactId>
-                            <version>${dokka.version}</version>
-                        </plugin>
-                    </dokkaPlugins>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
@@ -166,7 +144,43 @@
             <id>release</id>
             <build>
                 <plugins>
-
+                    <plugin>
+                        <groupId>org.jetbrains.dokka</groupId>
+                        <artifactId>dokka-maven-plugin</artifactId>
+                        <version>${dokka.version}</version>
+                        <executions>
+                            <execution>
+                                <phase>prepare-package</phase>
+                                <goals>
+                                    <goal>dokka</goal>
+                                    <goal>javadoc</goal>
+                                    <goal>javadocJar</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                        <configuration>
+                            <dokkaPlugins>
+                                <plugin>
+                                    <groupId>org.jetbrains.dokka</groupId>
+                                    <artifactId>kotlin-as-java-plugin</artifactId>
+                                    <version>${dokka.version}</version>
+                                </plugin>
+                            </dokkaPlugins>
+                        </configuration>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-javadoc-plugin</artifactId>
+                        <version>3.4.0</version>
+                        <executions>
+                            <execution>
+                                <id>attach-javadocs</id>
+                                <goals>
+                                    <goal>jar</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-gpg-plugin</artifactId>