Fix disk label for nf-test runner.

Author: FloWuenne

.github/workflows/nf-test.yml

@@ -28,9 +28,8 @@ jobs:
   nf-test-changes:
     name: nf-test-changes
     runs-on: # use self-hosted runners
-      - runs-on=${{ github.run_id }}-nf-test-changes
-      - runner=4cpu-linux-x64
-      - disk=large
+      - runs-on=${{github.run_id}}-nf-test-changes
+      - runner=4cpu-linux-x64/disk=large
     outputs:
       shard: ${{ steps.set-shards.outputs.shard }}
       total_shards: ${{ steps.set-shards.outputs.total_shards }}