fix: use POSIX tar format to support systems with large GID/UID values

Switch tarLongFileMode from 'gnu' to 'posix' in all assembly executions
to remove the 2,097,151 limit on UID/GID values imposed by GNU tar format.

Fixes #3939

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: robfrank

package/pom.xml

@@ -59,7 +59,7 @@
                                 <descriptor>./src/main/assembly/full.xml</descriptor>
                             </descriptors>
                             <ignoreDirFormatExtensions>false</ignoreDirFormatExtensions>
-                            <tarLongFileMode>gnu</tarLongFileMode>
+                            <tarLongFileMode>posix</tarLongFileMode>
                         </configuration>
                     </execution>
                     <execution>
@@ -75,7 +75,7 @@
                                 <descriptor>./src/main/assembly/minimal.xml</descriptor>
                             </descriptors>
                             <ignoreDirFormatExtensions>false</ignoreDirFormatExtensions>
-                            <tarLongFileMode>gnu</tarLongFileMode>
+                            <tarLongFileMode>posix</tarLongFileMode>
                         </configuration>
                     </execution>
                     <execution>
@@ -91,7 +91,7 @@
                                 <descriptor>./src/main/assembly/headless.xml</descriptor>
                             </descriptors>
                             <ignoreDirFormatExtensions>false</ignoreDirFormatExtensions>
-                            <tarLongFileMode>gnu</tarLongFileMode>
+                            <tarLongFileMode>posix</tarLongFileMode>
                         </configuration>
                     </execution>
                     <execution>
@@ -107,7 +107,7 @@
                                 <descriptor>./src/main/assembly/base.xml</descriptor>
                             </descriptors>
                             <ignoreDirFormatExtensions>false</ignoreDirFormatExtensions>
-                            <tarLongFileMode>gnu</tarLongFileMode>
+                            <tarLongFileMode>posix</tarLongFileMode>
                         </configuration>
                     </execution>
                 </executions>