Added gitlab-ci file.

.gitlab-ci.yml

+image: maven:latest
+
+variables:
+  MAVEN_CLI_OPTS: "-s .m2/settings.xml --batch-mode"
+  MAVEN_OPTS: "-Dmaven.repo.local=.m2/repository"
+
+cache:
+  paths:
+    - .m2/repository/
+    - target/
+
+build:
+  stage: build
+  script:
+    - mvn $MAVEN_CLI_OPTS compile
+
+test:
+  stage: test
+  script:
+    - mvn $MAVEN_CLI_OPTS test
+
+deploy:
+  stage: deploy
+  script:
+    - mvn $MAVEN_CLI_OPTS deploy
+  only:
+    - master
\ No newline at end of file

.m2/settings.xml

+<settings xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd"
+          xmlns="http://maven.apache.org/SETTINGS/1.1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+    <servers>
+        <server>
+            <id>central</id>
+            <username>${env.MAVEN_REPO_USER}</username>
+            <password>${env.MAVEN_REPO_PASS}</password>
+        </server>
+    </servers>
+</settings>
\ No newline at end of file

pom.xml

@@ -54,4 +54,17 @@
             <version>2.3.0</version>
         </dependency>
     </dependencies>
+
+    <distributionManagement>
+        <repository>
+            <id>central</id>
+            <name>artifactory.codecentric.de-releases</name>
+            <url>${env.MAVEN_REPO_URL}/public</url>
+        </repository>
+        <snapshotRepository>
+            <id>snapshots</id>
+            <name>artifactory.codecentric.de-snapshots</name>
+            <url>${env.MAVEN_REPO_URL}/public</url>
+        </snapshotRepository>
+    </distributionManagement>
 </project>