Merge branch 'test-render-graph' into 'main'

Test graph generation

See merge request !9

.gitlab-ci.yml

 run_tests:
   image: "python:$VERSION"
   script:
+    - apt update && apt install -y graphviz
     - pip install -e .[dev]
     - export PYTHONPATH="$(pwd)"
     - coverage run --source . run_tests.py

tests/test_cli.py

@@ -7,8 +7,8 @@ from bioflow_insight_cli.main import cli
 
 class TestCall(unittest.TestCase):
     def test_cli_works(self):
-        #cli("./wf_test/main.nf", render_graphs=False)
         cli("./wf_test/main.nf", render_graphs=False)
+        cli("./wf_test/main.nf", render_graphs=True)
 
     def test_cli_output_considered(self):
         with TemporaryDirectory() as my_temp_dir: