Add pytest configuration to pyproject.toml

Include pytest minimum version and the `tests/` path in pyproject.toml. This is
done to avoid collection of the dependency `env/src/sogcommand/SOGcommand/tests/`
directory in the GHA pytest-with-coverage workflow.

pyproject.toml

@@ -54,6 +54,13 @@ bloomcast = "bloomcast.main:main"
 ensemble = "bloomcast.ensemble:Ensemble"
 
 
+[tool.pytest.ini_options]
+minversion = "6.0"
+testpaths = [
+    "tests",
+]
+
+
 [tool.coverage.run]
 branch = true
 source = [ "bloomcast", "tests"]