ci: add GPG settings

Author: javier-godoy

pom.xml

@@ -423,6 +423,32 @@
 				</plugins>
 			</build>
 		</profile>
+		<profile>
+			<id>gpg</id>
+			<activation>
+				<property>
+					<name>gpg.passphrase</name>
+				</property>
+			</activation>
+			<build>
+				<plugins>
+					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
+						<artifactId>maven-gpg-plugin</artifactId>
+						<version>3.1.0</version>
+						<executions>
+							<execution>
+								<id>sign-artifacts</id>
+								<phase>verify</phase>
+								<goals>
+									<goal>sign</goal>
+								</goals>
+							</execution>
+						</executions>
+					</plugin>
+				</plugins>
+			</build>
+		</profile>
 		<profile>
 			<id>demo-jar</id>
 			<build>