Install lxml missing library in uenv v10

Author: aurianer

.gitlab/pipeline_reframe_ci.yml

@@ -20,6 +20,7 @@ test_reframe:
     - hipcc --version || echo "HIP not found in PATH"
     # Install reframe
     - git clone --depth 1 -b v4.8.4 https://github.com/reframe-hpc/reframe.git
+    - pip install --only-binary=:all: lxml
     - pushd reframe && ./bootstrap.sh && popd
     # Run gpu-benchmarks reframe tests
     - git clone --depth 1 https://github.com/eth-cscs/cscs-reframe-tests.git