Archive pom file for our maven testing repo

Gradle 6 requires the pom file to be present (pre 6 is fine with just the jar)

Bug: 144182671, 144517384
Change-Id: I7e289c621754b342b8a50decf616143c726ff3d4
diff --git a/tools/create_maven_release.py b/tools/create_maven_release.py
index 6d7d8ab..72186a8 100755
--- a/tools/create_maven_release.py
+++ b/tools/create_maven_release.py
@@ -258,6 +258,9 @@
         group=group, artifact=artifact, version=version)
   return result
 
+def write_default_r8_pom_file(pom_file, version):
+  write_pom_file(R8_POMTEMPLATE, pom_file, version, generate_dependencies(), '')
+
 def write_pom_file(template, pom_file, version, dependencies='', library_licenses=''):
   version_pom = template.substitute(
       version=version, dependencies=dependencies, library_licenses=library_licenses)