test: debug ssh key

.gitea/workflows/provision_configure.yaml

@@ -71,6 +71,12 @@ jobs:
           printf "%s" "${{ secrets.SKYLAB_SSH_PRIVATE_KEY }}" > /skylab
           chmod 600 /skylab
 
+      - name: Debug SSH key
+        run: |
+          head -n 5 /skylab
+          file /skylab
+          ssh -i /skylab -o StrictHostKeyChecking=no testuser@192.168.1.19 "echo SSH connection OK"
+
       - name: Install Ansible
         shell: bash
         run: |