Adding GitLab CI configuration

.gitlab-ci.yml

+image: registry.felinewith.me/dockerhelper/maven:master
+
+variables:
+  # This will supress any download for dependencies and plugins or upload messages which would clutter the console log.
+  # `showDateTime` will show the passed time in milliseconds. You need to specify `--batch-mode` to make this work.
+  MAVEN_OPTS: "-Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=WARN -Dorg.slf4j.simpleLogger.showDateTime=true -Djava.awt.headless=true"
+  # As of Maven 3.3.0 instead of this you may define these options in `.mvn/maven.config` so the same config is used
+  # when running from the command line.
+  # `installAtEnd` and `deployAtEnd`are only effective with recent version of the corresponding plugins.
+  MAVEN_CLI_OPTS: "--batch-mode --errors --show-version"
+
+stages:
+ - compile
+ - deploy
+
+compile:
+  stage: compile
+  script:
+    - mvn -Dgit-rev="`git describe`" $MAVEN_CLI_OPTS compile test
+    - mvn -Dgit-rev="`git describe`" $MAVEN_CLI_OPTS package
+    - mvn -Dgit-rev="`git describe`" $MAVEN_CLI_OPTS install
+    - mvn -Dgit-rev="`git describe`" $MAVEN_CLI_OPTS deploy
+
+pages:
+  stage: deploy
+  script:
+    - mvn -Dgit-rev="`git describe`" $MAVEN_CLI_OPTS test
+    - mvn -Dgit-rev="`git describe`" $MAVEN_CLI_OPTS site
+    - mvn -Dgit-rev="`git describe`" $MAVEN_CLI_OPTS site:stage
+    - mv target/staging public
+  artifacts:
+    paths:
+    - public
+  only:
+    - master

pom.xml

@@ -212,10 +212,6 @@ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/ma
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-javadoc-plugin</artifactId>
 			</plugin>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-site-plugin</artifactId>
-			</plugin>
 		</plugins>
 
 <!-- MAVEN BUILD DEPENDENCIES ************************************************************* MAVEN BUILD DEPENDENCIES -->
@@ -286,17 +282,6 @@ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/ma
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-site-plugin</artifactId>
 					<version>3.6</version>
-					<executions>
-						<execution>
-							<id>attach-site</id>
-							<configuration>
-								<classifier>site</classifier>
-							</configuration>
-							<goals>
-								<goal>jar</goal>
-							</goals>
-						</execution>
-					</executions>
 				</plugin>
 			</plugins>
 		</pluginManagement>