fix gpg user-agent

Author: Damian Staszewski

deploying/settings.xml

@@ -14,6 +14,7 @@
             </activation>
             <properties>
                 <gpg.executable>gpg</gpg.executable>
+                <gpg.useagent>true</gpg.useagent>
                 <gpg.keyname>${env.GPG_KEY_NAME}</gpg.keyname>
                 <gpg.passphrase>${env.GPG_PASSPHRASE}</gpg.passphrase>
             </properties>