Add and filter gcube/extra-resources folder to the output jar/war.

pom.xml

@@ -914,6 +914,45 @@
                 <version>${plugin.build.helper.version}</version>
             </plugin>
 
+			<plugin>
+				<artifactId>maven-resources-plugin</artifactId>
+				<version>${plugin.resources.version}</version>
+				<executions>
+					<execution>
+						<id>copy-web-inf</id>
+						<phase>validate</phase>
+						<goals>
+							<goal>copy-resources</goal>
+						</goals>
+						<configuration>
+							<outputDirectory>${project.build.outputDirectory}/WEB-INF</outputDirectory>
+							<resources>
+								<resource>
+									<directory>gcube/extra-resources/WEB-INF</directory>
+									<filtering>true</filtering>
+								</resource>
+							</resources>
+						</configuration>
+					</execution>
+					<execution>
+						<id>copy-meta-inf</id>
+						<phase>validate</phase>
+						<goals>
+							<goal>copy-resources</goal>
+						</goals>
+						<configuration>
+							<outputDirectory>${project.build.outputDirectory}/META-INF</outputDirectory>
+							<resources>
+								<resource>
+									<directory>gcube/extra-resources/META-INF</directory>
+									<filtering>true</filtering>
+								</resource>
+							</resources>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-source-plugin</artifactId>
@@ -991,6 +1030,7 @@
 		<plugin.compiler.version>3.8.1</plugin.compiler.version>
 		<plugin.source.version>2.1.2</plugin.source.version>
 		<plugin.javadoc.version>2.8</plugin.javadoc.version>
+		<plugin.resources.version>3.1.0</plugin.resources.version>
 
 		<!-- default value for the distro directory -->
 		<distroDirectory>distro</distroDirectory>