make gitlab ci jobs interruptible and silence install

.gitlab-ci.yml

@@ -8,24 +8,27 @@ cache:
     - venv/
 
 before_script:
-  - apt-get update
-  - apt-get install -y python3 git python3-pip
-  - pip3 install virtualenv
-  - virtualenv venv
-  - source venv/bin/activate
-  - pip3 install .
-  - pip3 install pytest-cov
-  - pip3 install .[tests]
+  - apt-get update -qq
+  - apt-get install -y python3 git python3-pip -qq > /dev/null
+  - pip3 install virtualenv -q
+  - virtualenv venv -q
+  - source venv/bin/activate -q
+  - pip3 install . -q
+  - pip3 install pytest-cov -q
+  - pip3 install .[tests] -q
 
 formatting:
+  interruptible: true
   script:
     - make check
 
 test:
+  interruptible: true
   script:
     - pytest tests
 
 coverage:
+  interruptible: true
   script:
     - pytest --cov=shakyground2/ tests/
     - coverage xml