caching apt and installing liblapack

.gitlab-ci.yml

@@ -14,6 +14,7 @@ cache:
   paths:
     - .cache/pip
     - venv/
+    - .cache/apt
 
 stages:
   - build
@@ -28,7 +29,10 @@ before_script:
 dist:
   stage: build
   script:
+    - mkdir -p .ache/apt
+    - apt-get update -yqq
     - apt-get install -y gfortran libopenblas-dev liblapack-dev
+    - apt-get -o dir::cache::archives=".cache/apt" install -y -qq gfortran liblapack-dev libgmp-dev
     - python setup.py bdist_wheel
     # an alternative approach is to install and run:
     - pip install dist/*