adjusted CI check github action to checkout the correct sdk branches.

Author: Florian-Limpoeck

.github/workflows/check.yml

@@ -16,10 +16,10 @@ jobs:
         run: |
           git clone https://github.com/hivemq/hivemq-extension-sdk.git ../hivemq-extension-sdk
           cd ../hivemq-extension-sdk
-          git checkout ${GITHUB_REF##*/} || true
+          git checkout ${GITHUB_REF#refs/heads/} || true
           git clone https://github.com/hivemq/hivemq-edge-extension-sdk.git ../hivemq-edge-extension-sdk
           cd ../hivemq-edge-extension-sdk
-          git checkout ${GITHUB_REF##*/} || true
+          git checkout ${GITHUB_REF#refs/heads/} || true
           cd ../hivemq-edge
       - name: Setup Java
         uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9 # v4