Add ubuntu tests

.gitlab-ci.yml

@@ -16,4 +16,18 @@ debian:
     - pip install .
   script:
     - ./tests/run.py
+
+ubuntu:
+  image: "ubuntu:latest"
+  before_script:
+    - apt update && apt install -y python3 python3-pip python-is-python3
+    - pip install numpy
+    - pip install build
+    - pip install virtualenv
+    - export PATH=${PATH}:${HOME}/.local/bin
+    - virtualenv myenv
+    - source myenv/bin/activate
+    - pip install .
+  script:
+    - ./tests/run.py