Fix missing dependency

.gitlab-ci.yml

@@ -2,7 +2,7 @@ default:
   image: ubuntu:22.04  # use latest for building/linting
   before_script:
     - apt update
-    - apt install -y libgfal2-dev python3.10 python3-pip cmake libboost-python-dev
+    - apt install -y libgfal2-dev python3.10 python3-pip cmake libboost-python-dev python3.10-venv
     - python3 --version # For debugging
     - python3 -m pip install --upgrade pip
     - pip install --upgrade tox twine