Add gpg plugin to google poms

Author: JarrodCTaylor

script/closure-library-release/google-closure-library-third-party.pom.template

@@ -16,6 +16,22 @@
 
     <url>http://code.google.com/p/closure-library/</url>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-gpg-plugin</artifactId>
+                <version>3.1.0</version>
+                <configuration>
+                    <gpgArguments>
+                        <arg>--pinentry-mode</arg>
+                        <arg>loopback</arg>
+                    </gpgArguments>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
     <description>
         The Google Closure Library is a collection of JavaScript code
         designed for use with the Google Closure JavaScript Compiler.

script/closure-library-release/google-closure-library.pom.template

@@ -24,6 +24,22 @@
         team at http://clojure.org/
     </description>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-gpg-plugin</artifactId>
+                <version>3.1.0</version>
+                <configuration>
+                    <gpgArguments>
+                        <arg>--pinentry-mode</arg>
+                        <arg>loopback</arg>
+                    </gpgArguments>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
     <dependencies>
         <dependency>
             <groupId>org.clojure</groupId>