Fix weekly qmain mandrel build (no mvn local)

The 23.0 mandrel packaging branch has no support for it and it's not
needed since we do testing of the new maven artefacts in later branches
23.1+

Author: jerboaa

.github/workflows/weekly.yml

@@ -116,6 +116,7 @@ jobs:
     uses: graalvm/mandrel/.github/workflows/base.yml@default
     with:
       quarkus-version: "main"
+      build-type: "mandrel-source-nolocalmvn"
       version: "mandrel/23.0"
       jdk: "17/ea"
       mandrel-packaging-version: "23.0"