Building docker image from maven

pom.xml

<build>
         <plugin>
                <groupId>com.spotify</groupId>
                <artifactId>dockerfile-maven-plugin</artifactId>
                <version>1.4.12</version>
                <executions>
                    <execution>
                        <id>tag-version</id>
                        <goals>
                            <goal>build</goal>
                            <goal>tag</goal>
                        </goals>
                        <configuration>
                            <tag>${project.version}</tag>
                            <repository>armor</repository>
                            <contextDirectory>${project.basedir}/docker/</contextDirectory>
                            <buildArgs>
                                <user_id>$(id -u)</user_id>
                                <group_id>$(id -g)</group_id>
                            </buildArgs>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>