Exchange pytest-flake8 with direct use of flake8.

Author: fschulze

.flake8

@@ -0,0 +1,2 @@
+[flake8]
+ignore = E501

.github/workflows/main.yml

@@ -97,3 +97,27 @@ jobs:
           set -xe -o nounset
           python -m tox -a -vv
           PIP_PRE=1 python -m tox -v -e ${{ matrix.tox-envs }} -- -v --color=yes
+
+  flake8:
+    env:
+      PY_COLORS: 1
+
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - uses: "actions/checkout@v3"
+      - uses: "actions/setup-python@v4"
+        with:
+          python-version: "3.x"
+      - name: "Install dependencies"
+        shell: "bash"
+        run: |
+          set -xe -o nounset
+          python -VV
+          python -m site
+          python -m pip install --upgrade pip flake8 setuptools wheel
+      - name: "Run flake8"
+        shell: "bash"
+        run: |
+          set -xe -o nounset
+          flake8 --config .flake8 src/devpi_constrained

tox.ini

@@ -9,16 +9,13 @@ commands=
 deps=
     server620: devpi-server==6.2.0
     beautifulsoup4
-    flake8<5
     pytest-cov
-    pytest-flake8
     pytest-instafail
     webtest
 
 
 [pytest]
-addopts = -ra --flake8 --cov-report=term --cov-report=html
-flake8-ignore = E501
+addopts = -ra --cov-report=term --cov-report=html
 testpaths = src/devpi_constrained
 markers =
     nomocking: do not mock anything in fixtures