fix makefile

Have to reference venv for some reason from make, doesn't have to happen
in interactive shells

Makefile

@@ -1,13 +1,13 @@
 .PHONY: docs
 test:
-	nix develop --impure . -c poetry install && pre-commit run --all-files --show-diff-on-failure
-	nix develop --impure . -c poetry install && ruff check .
-	nix develop --impure .#python39 -c poetry install && coverage run -m pytest
-	nix develop --impure .#python310 -c poetry install && coverage run -m pytest
-	nix develop --impure .#python311 -c poetry install && coverage run -m pytest
-	nix develop --impure .#python312 -c poetry install && coverage run -m pytest
-	nix develop --impure . -c poetry install && coverage report
+	nix develop --impure . -c ./.venv/bin/pre-commit run --all-files --show-diff-on-failure
+	nix develop --impure . -c ./.venv/bin/ruff check .
+	nix develop --impure .#python39 -c ./.venv/bin/coverage run -m pytest
+	nix develop --impure .#python310 -c ./.venv/bin/coverage run -m pytest
+	nix develop --impure .#python311 -c ./.venv/bin/coverage run -m pytest
+	nix develop --impure .#python312 -c ./.venv/bin/coverage run -m pytest
+	nix develop --impure . -c ./.venv/bin/coverage report
 safety:
-	nix develop --impure . -c poetry install && safety check --file=poetry.lock --full-report
+	nix develop --impure . -c ./.venv/bin/safety check --file=poetry.lock --full-report
 docs:
-	nix develop --impure . -c poetry install && sphinx-build docs/source docs/_build
+	nix develop --impure . -c ./.venv/bin/sphinx-build docs/source docs/_build