🎭 Enable output ANSI-colorization in CI

.github/workflows/self-smoke-test-action.yml

@@ -6,6 +6,22 @@ on:   # yamllint disable-line rule:truthy
   push:
   pull_request:
 
+env:
+  FORCE_COLOR: 1  # Request colored output from CLI tools supporting it
+  MYPY_FORCE_COLOR: 1  # MyPy's color enforcement
+  PIP_DISABLE_PIP_VERSION_CHECK: 1
+  PIP_NO_PYTHON_VERSION_WARNING: 1
+  PIP_NO_WARN_SCRIPT_LOCATION: 1
+  PY_COLORS: 1  # Recognized by the `py` package, dependency of `pytest`
+  TOX_PARALLEL_NO_SPINNER: 1
+  TOX_TESTENV_PASSENV: >-  # Make tox-wrapped tools see color requests
+    FORCE_COLOR
+    MYPY_FORCE_COLOR
+    NO_COLOR
+    PY_COLORS
+    PYTEST_THEME
+    PYTEST_THEME_MODE
+
 jobs:
   smoke-test:
     runs-on: ubuntu-latest