Support local specification of gpg publishing key

Author: PatrickCroninMM

README.dev.md

@@ -47,6 +47,17 @@ Put this information into `~/.m2/settings.xml` (Maven settings). Your
           <username>git</username>
         </server>
       </servers>
+      <profiles>
+        <profile>
+          <id>my_profile_id</id>
+          <activation>
+            <activeByDefault>true</activeByDefault>
+          </activation>
+          <properties>
+            <gpg.keyname><!-- The GPG ID of your publishing key --></gpg.keyname>
+          </properties>
+        </profile>
+      </profiles>
     </settings>
 
 Some links about Sonatype:
@@ -56,6 +67,12 @@ Some links about Sonatype:
 * http://central.sonatype.org/pages/apache-maven.html
 
 
+See the following documentation for details on specifying which gpg to use for
+publishing in your local settings.xml:
+
+* https://central.sonatype.org/publish/requirements/gpg/
+* https://maven.apache.org/plugins/maven-gpg-plugin/usage.html
+
 ## Setting up GPG
 You need a key. It is fine to create/use your own, but you'll probably want
 one with your MaxMind email address.

pom.xml

@@ -174,6 +174,10 @@
                         <goals>
                             <goal>sign</goal>
                         </goals>
+                        <configuration>
+                            <keyname>${gpg.keyname}</keyname>
+                            <passphraseServerId>${gpg.keyname}</passphraseServerId>
+                        </configuration>
                     </execution>
                 </executions>
             </plugin>