added maven dockerfile build plugin from spotify

pom.xml

@@ -17,6 +17,7 @@
     <properties>
         <java.version>1.8</java.version>
         <kotlin.version>1.2.71</kotlin.version>
+        <docker.image.prefix>because</docker.image.prefix>
     </properties>
 
     <dependencies>
@@ -74,6 +75,17 @@
                 </configuration>
             </plugin>
 
+
+                <plugin>
+                    <groupId>com.spotify</groupId>
+                    <artifactId>dockerfile-maven-plugin</artifactId>
+                    <version>1.4.9</version>
+                    <configuration>
+                        <repository>${docker.image.prefix}/${project.artifactId}</repository>
+                    </configuration>
+                </plugin>
+
+
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-dependency-plugin</artifactId>
@@ -98,8 +110,6 @@
             </plugin>
 
 
-
-
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>