Publish artifacts on Maven Central

.ci-maven-settings.xml

+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
+                      http://maven.apache.org/xsd/settings-1.0.0.xsd">
+	<servers>
+		<server>
+			<id>ossrh</id>
+			<username>${env.OSSRH_USER}</username>
+			<password>${env.OSSRH_PASS}</password>
+		</server>
+	</servers>
+	<profiles>
+		<profile>
+			<id>ossrh</id>
+			<activation>
+				<activeByDefault>true</activeByDefault>
+			</activation>
+			<properties>
+				<gpg.executable>${env.GPG_EXECUTABLE}</gpg.executable>
+				<gpg.passphrase>${env.GPG_PASSPHRASE}</gpg.passphrase>
+			</properties>
+		</profile>
+	</profiles>
+</settings>

.gitlab-ci.yml

-image: maven:3-jdk-8
+stages:
+  - build
 
-build:
-  script: "mvn install -B"
+run tests in branches:
+  stage:                  build
+  image:                  maven:3-jdk-8
+  script:
+    - MAVEN_OPTS="${MAVEN_OPTS} -Dorg.slf4j.simpleLogger.defaultLogLevel=warn" mvn test -B
+  except:
+    - master
+    - tags
 
-  artifacts:
-    paths:
-    - geotools-cli/target/geotools-cli*.jar
-    - geotools-cli/target/lib/*.jar
+publish maven snapshot artifacts:
+    stage:                build
+    image:                maven:3-jdk-8
+    script:
+      - echo "${GPG_KEY_SECRET}" | gpg --allow-secret-key-import --import
+      - gpg --list-keys
+      - mvn clean deploy --settings .ci-maven-settings.xml -B -U
+    only:
+      - master
+
+publish maven artifacts:
+    stage:                build
+    image:                maven:3-jdk-8
+    script:
+      - echo "${GPG_KEY_SECRET}" | gpg --allow-secret-key-import --import
+      - gpg --list-keys
+      - mvn clean deploy --settings .ci-maven-settings.xml -B -U -Prelease
+    only:
+      - tags

pom.xml

@@ -124,4 +124,71 @@
 			</plugin>
 		</plugins>
 	</build>
+	
+	<profiles>
+		<profile>
+			<id>release</id>
+			<activation>
+				<activeByDefault>false</activeByDefault>
+			</activation>
+			<build>
+				<plugins>
+					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
+						<artifactId>maven-source-plugin</artifactId>
+						<version>2.2.1</version>
+						<executions>
+							<execution>
+								<id>attach-sources</id>
+								<goals>
+									<goal>jar-no-fork</goal>
+								</goals>
+							</execution>
+						</executions>
+					</plugin>
+					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
+						<artifactId>maven-javadoc-plugin</artifactId>
+						<version>2.9.1</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>
+						<version>${maven-gpg-plugin.version}</version>
+						<executions>
+							<execution>
+								<id>sign-artifacts</id>
+								<phase>verify</phase>
+								<goals>
+									<goal>sign</goal>
+								</goals>
+							</execution>
+						</executions>
+					</plugin>
+				</plugins>
+			</build>
+		</profile>
+	</profiles>
+
+	<distributionManagement>
+		<repository>
+			<id>ossrh</id>
+			<name>Sonatype Releases</name>
+			<url>https://oss.sonatype.org/service/local/staging/deploy/maven2</url>
+		</repository>
+		<snapshotRepository>
+			<id>ossrh</id>
+			<name>Sonatype Snapshots</name>
+			<url>https://oss.sonatype.org/content/repositories/snapshots</url>
+			<uniqueVersion>true</uniqueVersion>
+		</snapshotRepository>
+	</distributionManagement>
 </project>