Add checks as a separate workflow

Run test suite only for PRs and master

.github/workflows/check.yml

@@ -0,0 +1,35 @@
+name: Check
+
+on:
+  pull_request:
+    branches:
+    - master
+  push:
+    branches:
+    - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        env:
+        - isort
+        - flake8
+        - bandit
+        - readme
+        - docs
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: actions/setup-python@v2
+      with:
+        python-version: '3.8'
+
+    - name: Install prerequisites
+      run: python -m pip install --upgrade setuptools pip wheel tox
+
+    - name: Run ${{ matrix.env }}
+      run: tox -e ${{ matrix.env }}

.github/workflows/test.yml

@@ -1,8 +1,12 @@
 name: Test
 
 on:
-- push
-- pull_request
+  pull_request:
+    branches:
+    - master
+  push:
+    branches:
+    - master
 
 jobs:
   build:
@@ -48,7 +52,7 @@ jobs:
         python -m pip install --upgrade pip
         python -m pip install --upgrade tox tox-gh-actions
 
-    - name: "Unit tests for py${{ matrix.python-version }}-django${{ matrix.django-version }}"
+    - name: Unit tests for py${{ matrix.python-version }}-django${{ matrix.django-version }}
       run: tox
       env:
         DJANGO: ${{ matrix.django-version }}

tox.ini

@@ -1,10 +1,14 @@
 [tox]
 envlist =
+    isort
+    flake8
+    bandit
     # Python/Django combinations that are officially supported
     py{36,37,38,39}-django{22}
     py{36,37,38,39,310}-django{32}
     py{38,39,310}-django{40}
-    py37-{flake8,bandit,readme,docs,isort}
+    readme
+    docs
 
 [testenv]
 description = Unit tests
@@ -33,30 +37,30 @@ DJANGO =
     3.2: django32
     4.0: django40
 
-[testenv:py37-bandit]
+[testenv:bandit]
 description = PyCQA security linter
 deps = bandit<1.6
 commands = - bandit -r --ini tox.ini
 ignore_errors = true
 
-[testenv:py37-docs]
+[testenv:docs]
 description = Build the HTML documentation
 deps = sphinx
 commands = sphinx-build -b html -d docs/_build/doctrees docs docs/_build/html
 whitelist_externals = make
 
-[testenv:py37-flake8]
+[testenv:flake8]
 description = Static code analysis and code style
 deps = flake8
 commands = flake8
 
-[testenv:py37-isort]
+[testenv:isort]
 description = Ensure imports are ordered
 skip_install = True
 deps = isort
 commands = isort tests setup.py analytical --check --diff
 
-[testenv:py37-readme]
+[testenv:readme]
 description = Ensure README renders on PyPI
 deps = twine
 commands =