Switch to nox testing and python containers

Switched to basic python containers, onto which the ci
steps simply install poetry.
This takes a little more processing time during pipeline running (~16s
per step),
but also gives much more flexibility in container usage.

Switching to nox for test automation across multiple python versions.

Fixing mypy library stubs missing for some imported libraries.

.woodpecker.yml

@@ -1,34 +1,42 @@
 # branches: main
 
 pipeline:
-  unit_tests:
-    image: mquade/poetry:3.9-1.1.11
-    commands:
-      - poetry config virtualenvs.create false
-      - poetry install
-      - pytest
-
   code_lint:
-    image: mquade/poetry:3.9-1.1.11
+    image: python
     commands:
-      - poetry config virtualenvs.create false
+      - pip install poetry
       - poetry install
       - pip install black
-      - black .
+      - echo "----------------- running lint ------------------"
+      - python --version && poetry --version && black --version
+      - poetry run black .
+
+  unit_tests:
+    image: thekevjames/nox
+    commands:
+      - pip install poetry
+      - poetry install
+      - echo "----------------- running tests ------------------"
+      - python --version && poetry --version && nox --version
+      - poetry run nox
 
   static_analysis:
-    image: mquade/poetry:3.9-1.1.11
+    image: python
     commands:
-      - poetry config virtualenvs.create false
+      - pip install poetry
       - poetry install
       - pip install mypy
-      - mypy .
+      - echo "----------------- running analysis ------------------"
+      - python --version && poetry --version && mypy --version
+      - poetry run mypy .
 
   build_dist:
-    image: mquade/poetry:3.9-1.1.11
+    image: python
     commands:
-      - poetry config virtualenvs.create false
+      - pip install poetry
       - poetry install
+      - echo "----------------- running analysis ------------------"
+      - python --version && poetry --version
       - poetry build
     when:
       branch: main

noxfile.py

@@ -1,4 +1,4 @@
-import nox  # type: ignore
+import nox
 
 
 @nox.session(python=["3.7", "3.8", "3.9"])

pyproject.toml

@@ -38,3 +38,13 @@ show_missing = true
 [build-system]
 requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"
+
+[[tool.mypy.overrides]]
+module = [
+    "click",
+    "click.testing",
+    "pytest",
+    "nox",
+    "importlib-metadata"
+]
+ignore_missing_imports = true