🐛 let tox create environments, only run it once in github action

- local error that env had to be defined by hand
- local package alwasy included if not specified otherwise?

follow latest tox guide: https://tox.wiki/en/4.18.0/user_guide.html

.github/workflows/tox-gha.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.11']
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py39, py310, py311, flake8
+envlist = py{39,310,311} flake8
 
 [travis]
 python =
@@ -9,19 +9,14 @@ python =
 
 [testenv:flake8]
 basepython = python
+skip_install = true
 deps = flake8
 commands = flake8 acore tests --ignore=E501,W605
 
 [testenv]
-setenv =
-    PYTHONPATH = {toxinidir}
 deps =
-    -e .
     pytest
-; If you want to make tox run the tests with the same versions, create a
-; requirements.txt with the pinned versions and uncomment the following line:
-;     -r{toxinidir}/requirements.txt
 commands =
     pip install -U pip
-    pytest --basetemp={envtmpdir}
+    pytest tests