Don't build in dockerfile, but in maven

Dockerfile

@@ -1,15 +1,8 @@
-FROM maven:3.6-openjdk-11
-ADD src /src/src/
-ADD pom.xml /src/
-WORKDIR /src
-RUN find .
-RUN mvn clean package
-
 FROM openjdk:16-jdk-alpine
 ADD https://github.com/just-containers/s6-overlay/releases/download/v2.1.0.2/s6-overlay-amd64-installer /tmp/
 RUN chmod +x /tmp/s6-overlay-amd64-installer && /tmp/s6-overlay-amd64-installer /
-COPY --from=0 /src/target/libraries/* /app/libraries/
-COPY --from=0 /src/target/*.jar /app/
+ADD target/libraries/* /app/libraries/
+ADD target/*.jar /app/
 WORKDIR /app
 ENTRYPOINT ["/init"]
-CMD ["java", "-XX:MaxRAMPercentage=80", "-cp", "*:libraries/*", "de.corelogics.mediaview.Main"]
+CMD ["java", "-XX:MaxRAMPercentage=80", "-jar", "mediatheken-dlna-bridge.jar"]

pom.xml

@@ -146,6 +146,7 @@
         </dependency>
     </dependencies>
     <build>
+        <finalName>mediatheken-dlna-bridge</finalName>
         <plugins>
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
@@ -193,6 +194,25 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>3.2.0</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <classpathPrefix>libraries/</classpathPrefix>
+                            <mainClass>de.corelogics.mediaview.Main</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>versions-maven-plugin</artifactId>
+                <version>2.8.1</version>
+            </plugin>
         </plugins>
     </build>
 </project>