src/it/projects/pom-packaging/pom.xml

<?xml version='1.0' encoding='UTF-8'?>

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>test-group</groupId>
  <artifactId>pom-packaging</artifactId>
  <version>1.0.0</version>
  <packaging>pom</packaging>
  
  <distributionManagement>
    <repository>
      <id>mrm</id>
      <url>@mrm.distribution.url@</url>
    </repository>
  </distributionManagement>

  <build>
    <plugins>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-sign-plugin</artifactId>
        <version>@project.version@</version>
        <executions>

          <execution>
            <goals>
              <goal>sign</goal>
            </goals>
            <configuration>
              <keyId>AC71B3E31C0C0D38</keyId>
              <keyPassphrase>testPass</keyPassphrase>
              <keyFile>@project.basedir@/src/test/resources/pgp-priv-key.asc</keyFile>
            </configuration>
          </execution>

        </executions>
      </plugin>
    </plugins>
  </build>
</project>