Generate and use pytest XML reports

This generates XML reports when we run pytest through poe, and
uploads them in the relevant CI stage.

I've also ignored mypy cache files - I'm not sure why this hasn't
been an issue before...

.gitignore

@@ -7,6 +7,9 @@
 __pycache__/
 *.py[cod]
 
+# Mypy cache
+.mypy_cache*
+
 # C extensions
 *.so
 
@@ -45,6 +48,7 @@ htmlcov/
 .cache
 nosetests.xml
 coverage.xml
+pytest_report.xml
 
 # Translations
 *.mo

.gitlab-ci.yml

@@ -102,6 +102,11 @@ pytest:
     - tags
     - web
 
+  artifacts:
+    when: always
+    reports:
+      junit: pytest_report.xml
+
 openapi:
   stage: testing
   image: python:3.7

pyproject.toml

@@ -44,7 +44,7 @@ black_check = "black --check ."
 isort = "isort openflexure_microscope"
 pylint = "pylint openflexure_microscope"
 mypy = "mypy --cobertura-xml-report openflexure_microscope openflexure_microscope"
-test = "pytest ."
+test = "pytest . --junitxml=pytest_report.xml"
 serve = "python -m openflexure_microscope.api.app"
 
 format = ["black", "isort"]