ci: create venv in its own step

.drone.yml

@@ -5,12 +5,16 @@ type: docker
 name: default
 
 steps:
+  - name: create virtual env
+    image: python:3.11-alpine
+    commands:
+      - python -m venv .venv
+
   - name: install
     image: python:3.11-alpine
     commands:
       - &path
         export PATH="${DRONE_WORKSPACE}/.venv/bin:$$PATH"
-      - python -m venv .venv
       - which pip
       - pip install black flake8 isort poetry