Add GPG signing to dependencies module.

Author: maciejwalkowiak

spring-cloud-aws-dependencies/pom.xml

@@ -35,6 +35,7 @@
 		<aws-java-sdk.version>1.11.951</aws-java-sdk.version>
 		<elasticache.version>1.1.1</elasticache.version>
 		<jmemcached.version>1.0.0</jmemcached.version>
+		<maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
 	</properties>
 	<dependencyManagement>
 		<dependencies>
@@ -206,6 +207,34 @@
 				</pluginRepository>
 			</pluginRepositories>
 		</profile>
+		<profile>
+			<id>release</id>
+			<build>
+				<plugins>
+					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
+						<artifactId>maven-gpg-plugin</artifactId>
+						<version>${maven-gpg-plugin.version}</version>
+						<configuration>
+							<!-- Prevent gpg from using pinentry programs -->
+							<gpgArguments>
+								<arg>--pinentry-mode</arg>
+								<arg>loopback</arg>
+							</gpgArguments>
+						</configuration>
+						<executions>
+							<execution>
+								<id>sign-artifacts</id>
+								<phase>verify</phase>
+								<goals>
+									<goal>sign</goal>
+								</goals>
+							</execution>
+						</executions>
+					</plugin>
+				</plugins>
+			</build>
+		</profile>
 	</profiles>
 
 	<distributionManagement>