ci: install tools in virtualenv

.drone.yml

@@ -4,11 +4,20 @@ kind: pipeline
 type: docker
 name: default
 
+environment:
+  PATH: ${DRONE_WORKSPACE}/.venv/bin:${PATH}
+
 steps:
+  - name: install
+    image: python:3.11-alpine
+    commands:
+      - virtualenv .venv
+      - which pip
+      - pip install black flake8 isort poetry
+
   - name: check style
     image: python:3.11-alpine
     commands:
-      - pip install black isort flake8
       - black --check .
       - isort -c .
       - flake8 .
@@ -16,7 +25,6 @@ steps:
   - name: build
     image: python:3.11-alpine
     commands:
-      - pip install poetry
       - poetry build
     when:
       event:
@@ -26,7 +34,6 @@ steps:
   - name: build and publish
     image: python:3.11-alpine
     commands:
-      - pip install poetry
       - poetry publish --build --repository git.luj0ga.de
     environment:
       POETRY_PYPI_TOKEN_git.luj0ga.de: