ci: add subuid

.github/workflows/ci.yml

@@ -36,6 +36,9 @@ jobs:
       run: |
         sudo apt-get update
         sudo apt-get install -y pristine-tar sbuild mmdebstrap util-linux dpkg-dev
+    - name: Setup subuid/subgid
+      run: |
+        usermod --add-subuids 100000-200000 --add-subgids 100000-200000 $USER
     - name: Run tests with verbose logging (timeout 30min)
       env:
         RUST_LOG: debug