Use the Maven JAR plugin to assign the classifier for x64 artifacts.

Author: Enfernuz

.github/workflows/maven-release-x64.yml

@@ -22,4 +22,4 @@ jobs:
         run: |
           mkdir ~/.m2
           echo "<settings><servers><server><id>github</id><username>Enfernuz</username><password>${GITHUB_TOKEN}</password></server></servers></settings>" > ~/.m2/settings.xml
-          mvn -B deploy -Dclassifier=x64
+          mvn -B deploy

pom.xml

@@ -10,7 +10,7 @@
 
     <name>JavaTrans2Quik</name>
     <url>https://github.com/Enfernuz/JavaTrans2Quik</url>
-    <description>A Java-wrapper for Trans2Quik.dll 1.3 ("QUIK", a trading platform designed by ARQA @ arqatech.com)</description>
+    <description>A Java-wrapper for x64 Trans2Quik.dll v1.3 ("QUIK", a trading platform designed by ARQA @ arqatech.com)</description>
 
     <scm>
         <url>https://github.com/Enfernuz/JavaTrans2Quik</url>
@@ -41,4 +41,24 @@
             <version>4.1.0</version>
         </dependency>
     </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>3.1.2</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                        <configuration>
+                            <classifier>x64</classifier>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
 </project>