build: isolate publish-time POM using flatten-maven-plugin

Author: bsayli

api-contract/pom.xml

@@ -48,6 +48,7 @@
         <maven-compiler-plugin.version>3.15.0</maven-compiler-plugin.version>
         <maven-source-plugin.version>3.4.0</maven-source-plugin.version>
         <maven-javadoc-plugin.version>3.12.0</maven-javadoc-plugin.version>
+        <flatten-maven-plugin.version>1.7.3</flatten-maven-plugin.version>
 
         <central-publishing-maven-plugin.version>0.10.0</central-publishing-maven-plugin.version>
         <maven-gpg-plugin.version>3.2.8</maven-gpg-plugin.version>
@@ -115,6 +116,31 @@
                     </execution>
                 </executions>
             </plugin>
+
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>flatten-maven-plugin</artifactId>
+                <version>${flatten-maven-plugin.version}</version>
+                <configuration>
+                    <flattenMode>ossrh</flattenMode>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>flatten</id>
+                        <phase>process-resources</phase>
+                        <goals>
+                            <goal>flatten</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>flatten-clean</id>
+                        <phase>clean</phase>
+                        <goals>
+                            <goal>clean</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>