Move GPG signing into release profile.

Closes #2214

pom.xml

@@ -77,6 +77,28 @@
 			<id>release</id>
 			<build>
 				<plugins>
+					<!-- Sign JARs -->
+					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
+						<artifactId>maven-gpg-plugin</artifactId>
+						<version>3.0.1</version>
+						<executions>
+							<execution>
+								<id>sign-artifacts</id>
+								<phase>verify</phase>
+								<goals>
+									<goal>sign</goal>
+								</goals>
+								<configuration>
+									<gpgArguments>
+										<arg>--pinentry-mode</arg>
+										<arg>loopback</arg>
+										<arg>--no-tty</arg>
+									</gpgArguments>
+								</configuration>
+							</execution>
+						</executions>
+					</plugin>
 
 					<!-- Make sure we build on Java 8 with only release dependencies -->
 
@@ -184,30 +206,6 @@
 				<pluginManagement>
 					<plugins>
 
-						<!-- Sign JARs -->
-
-						<plugin>
-							<groupId>org.apache.maven.plugins</groupId>
-							<artifactId>maven-gpg-plugin</artifactId>
-							<version>3.0.1</version>
-							<executions>
-								<execution>
-									<id>sign-artifacts</id>
-									<phase>verify</phase>
-									<goals>
-										<goal>sign</goal>
-									</goals>
-									<configuration>
-										<gpgArguments>
-											<arg>--pinentry-mode</arg>
-											<arg>loopback</arg>
-											<arg>--no-tty</arg>
-										</gpgArguments>
-									</configuration>
-								</execution>
-							</executions>
-						</plugin>
-
 						<!-- Deploy to Sonatype OSS Nexus -->
 
 						<plugin>
@@ -228,11 +226,6 @@
 
 				<plugins>
 
-					<plugin>
-						<groupId>org.apache.maven.plugins</groupId>
-						<artifactId>maven-gpg-plugin</artifactId>
-					</plugin>
-
 					<plugin>
 						<groupId>org.sonatype.plugins</groupId>
 						<artifactId>nexus-staging-maven-plugin</artifactId>