fix extra - should be docs, not doc

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 skipsdist = true
 isolated_build = true
-envlist = py310, py311, lint
+envlist = py310, py311, lint, build
 
 [gh-actions]
 python =
@@ -10,18 +10,25 @@ python =
 
 [testenv:lint]
 deps =
-    .[dev,doc]
+    .[dev,docs]
 commands =
-    ruff format src
     ruff check src
-    mypy -m src --exclude ^(tests|examples)
-    python -m build
+    mypy src
     mkdocs build -v
+
+[testenv:build]
+deps =
+    build
+    twine
+commands =
+    python -m build
     twine check dist/*
 
 [testenv]
-allowlist_externals = ruff,mypy,mkdocs,twine
-passenv = *
+allowlist_externals = ruff, mypy, mkdocs, twine
+passenv =
+    HOME
+    USER
 setenv =
     PYTHONPATH = {toxinidir}
     PYTHONWARNINGS = ignore