Keep automated release tagging in dry-run mode

We should first make sure this actually works on this repository before
enabling it in production.

Author: tautschnig

.github/workflows/create-release-tag.yaml

@@ -32,3 +32,4 @@ jobs:
         DEFAULT_BUMP: none
         RELEASE_BRANCHES: develop
         VERBOSE: false
+        DRY_RUN: true