Migrate to Maven Central Portal and fix CI memory issues

- Replace nexus-staging-maven-plugin with central-publishing-maven-plugin 0.9.0
- Add maven-source-plugin to generate required sources JAR for Central Portal
- Remove deprecated distributionManagement section
- Add -Dforce.fast=true to GitLab CI to avoid memory issues with JFlex DFA generation

Change-Id: Idd8d5b2d6a2713d93fb0d18429e7d73a7b68f021
diff --git a/pom.xml b/pom.xml
index 4172e92..6b67abf 100644
--- a/pom.xml
+++ b/pom.xml
@@ -50,16 +50,6 @@
         <maven.project.sourceRoots.warningsDisabled>true</maven.project.sourceRoots.warningsDisabled>
     </properties>
 
-    <distributionManagement>
-        <snapshotRepository>
-            <id>korap</id>
-            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
-        </snapshotRepository>
-        <repository>
-            <id>korap</id>
-            <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
-        </repository>
-    </distributionManagement>
 
     <build>
         <resources>
@@ -303,6 +293,20 @@
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-source-plugin</artifactId>
+                <version>3.3.0</version>
+                <executions>
+                    <execution>
+                        <id>attach-sources</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>jar-no-fork</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
                 <version>3.6.3</version>
                 <configuration>
@@ -341,14 +345,13 @@
                 </executions>
             </plugin>
             <plugin>
-                <groupId>org.sonatype.plugins</groupId>
-                <artifactId>nexus-staging-maven-plugin</artifactId>
-                <version>1.6.13</version>
+                <groupId>org.sonatype.central</groupId>
+                <artifactId>central-publishing-maven-plugin</artifactId>
+                <version>0.9.0</version>
                 <extensions>true</extensions>
                 <configuration>
-                    <serverId>korap</serverId>
-                    <nexusUrl>https://s01.oss.sonatype.org/</nexusUrl>
-                    <autoReleaseAfterClose>false</autoReleaseAfterClose>
+                    <publishingServerId>central</publishingServerId>
+                    <autoPublish>false</autoPublish>
                 </configuration>
             </plugin>
         </plugins>