Chore: Replaces gpg with maven_gpg variables

Author: SundermannC

.github/workflows/java.yml

@@ -60,4 +60,4 @@ jobs:
       env:
         MAVEN_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
         MAVEN_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
-        GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
+        MAVEN_GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}

java/pom.xml

@@ -156,6 +156,7 @@
                         <arg>--pinentry-mode</arg>
                         <arg>loopback</arg>
                     </gpgArguments>
+                    <passphrase>${env.MAVEN_GPG_PASSPHRASE}</passphrase>
                 </configuration>
                 <executions>
                     <execution>