ci: use GitHub only release (#6)

# Description

A Maven release does not work here as the `pom.xml` is incomplete and
the release always fails. We don't want to push the template file to
Maven.

A new repository using this template runs the
`.github/update_workflows.sh` which copies the correct files.

# Verification

None

.github/workflows/release.yml

@@ -9,5 +9,6 @@ on:
 
 jobs:
   default:
-    uses: Hapag-Lloyd/Workflow-Templates/.github/workflows/maven_release_callable.yml@c34ea75ff9e52d92a9433a19dd9fcd473bac2eee
+    # using a GitHub only release here. Use .github/update_workflows.sh to switch to a Maven release
+    uses: Hapag-Lloyd/Workflow-Templates/.github/workflows/default_release_callable.yml@c34ea75ff9e52d92a9433a19dd9fcd473bac2eee
     secrets: inherit