Add separate tox environment for flake8 linting.

.flake8

@@ -0,0 +1,2 @@
+[flake8]
+ignore = E501,W503,W504

.github/workflows/main.yml

@@ -18,6 +18,9 @@ jobs:
           - python-version: "3.7"
             tox-envs: "py37"
             continue-on-error: false
+          - python-version: "3.7"
+            tox-envs: "flake8"
+            continue-on-error: false
           - python-version: "3.8"
             tox-envs: "py38"
             continue-on-error: false

tox.ini

@@ -1,5 +1,6 @@
 [tox]
 envlist =
+    flake8
     py27{,-ansible19,-ansible24,-ansible25,-ansible26,-ansible27,-ansible28,-ansible29,-ansible210},
     py37{,-ansible25,-ansible26,-ansible27,-ansible28,-ansible29,-ansible210},
     py38{,-ansible25,-ansible26,-ansible27,-ansible28,-ansible29,-ansible210},
@@ -22,19 +23,23 @@ deps =
     ansiblecore213: ansible-core>=2.13,<2.14dev
     ansiblecore214: ansible-core>=2.14,<2.15dev
     ansiblecore215: ansible-core>=2.15,<2.16dev
+    ansiblecore216: ansible-core>=2.16,<2.17dev
+    ansiblecore217: ansible-core>=2.17,<2.18dev
     coverage
-    flake8<5
     mock
     pytest
     pytest-cov
-    pytest-flake8 < 1.1.0;python_version=="2.7"
-    pytest-flake8;python_version!="2.7"
 changedir = {envdir}
 commands =
     {envbindir}/py.test --cov {envsitepackagesdir}/ploy_ansible/ --cov-report html:{toxinidir}/htmlcov_{envname} {posargs} {envsitepackagesdir}/ploy_ansible/
 
 
+[testenv:flake8]
+commands = flake8 --config {toxinidir}/.flake8 {toxinidir}
+deps = flake8
+skip_install = true
+
+
 [pytest]
-addopts = --flake8 --tb=native
-flake8-ignore = E501 W503 W504
+addopts = --tb=native
 log_level = NOTSET