jgit.dirtyWorkingTree ignore when deploying to Central

since we change MANIFEST and POMs when releasing to Maven Central we
must disable the error because the Git working tree will be dirty

releng/org.eclipse.emf.parsley.parent/pom.xml

@@ -483,7 +483,6 @@
 				<module>../../dsl/org.eclipse.emf.parsley.dsl.standalone.lib</module>
 				<module>../../dsl/org.eclipse.emf.parsley.dsl.standalone</module>
 			</modules>
-
 		</profile>
 
 		<profile>
@@ -530,6 +529,20 @@
 			</activation>
 
 			<build>
+				<pluginManagement>
+					<plugins>
+						<plugin>
+							<groupId>org.eclipse.tycho</groupId>
+							<artifactId>tycho-packaging-plugin</artifactId>
+							<version>${tycho-version}</version>
+							<configuration>
+								<!-- since we change MANIFEST and POMs when releasing to Maven Central
+									we must disable the error because the Git working tree will be dirty -->
+								<jgit.dirtyWorkingTree>ignore</jgit.dirtyWorkingTree>
+							</configuration>
+						</plugin>
+					</plugins>
+				</pluginManagement>
 				<plugins>
 					<plugin>
 						<groupId>org.sonatype.plugins</groupId>
@@ -542,7 +555,6 @@
 							<autoReleaseAfterClose>true</autoReleaseAfterClose>
 						</configuration>
 					</plugin>
-
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-javadoc-plugin</artifactId>