Enhance SSH setup in deployment workflow to include error handling for empty SSH key

.gitea/workflows/deploy-dev.yml

@@ -31,6 +31,13 @@ jobs:
       - name: Setup SSH
         shell: sh
         run: |
+          set -e
+
+          if [ -z "${DEPLOY_SSH_KEY}" ]; then
+            echo "❌ DEPLOY_SSH_KEY is EMPTY"
+            exit 1
+          fi
+
           mkdir -p ~/.ssh
           chmod 700 ~/.ssh