apertis-pkg-merge-*: Make the local suffix customizable

Downstreams need a different local suffix for their packages and we may change ours at some point.

package-source-builder/overlay/usr/bin/apertis-pkg-merge-updates

@@ -94,6 +94,7 @@ def main():
   parser.add_argument('--package', dest='package', type=str, help='the package name (e.g. glib2.0)') # TODO: figure this out from the repo
   parser.add_argument('--downstream', dest='downstream', type=str, help='the downstream branch (e.g. apertis/v2020dev0)')
   parser.add_argument('--upstream', dest='upstream', type=str, required=True, help='the upstream branch (e.g. debian/buster)')
+  parser.add_argument('--local-version-suffix', dest="local_suffix", type=str, default="co", help='the local version suffix to be used in the new changelog entry')
   args = parser.parse_args()
   package_name = args.package
 
@@ -121,7 +122,7 @@ def main():
     # we carry some changes in addition to changelog entries
     # and metadata under debian/apertis, so someone should
     # re-summarize the remaining changes
-    version = upstream_version.full_version + 'co1'
+    version = upstream_version.full_version + args.local_suffix + '1'
     bump_version(
         version,
         ['PLEASE SUMMARIZE remaining Apertis changes'],
@@ -129,7 +130,7 @@ def main():
     )
   else:
     # no changes, but we add a suffix anyway
-    version = upstream_version.full_version + 'co0'
+    version = upstream_version.full_version + args.local_suffix + '0'
     bump_version(
         version,
         [f'Sync from Debian {args.upstream}.'],