adjust ci settings to match pretalx settings

.github/workflows/style.yml

@@ -61,6 +61,30 @@ jobs:
       - name: Run flake8
         run: flake8 .
         working-directory: .
+  black:
+    name: black
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: install gettext
+        run: sudo apt install gettext
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+      - uses: actions/cache@v1
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/setup.py') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+      - name: Install pretalx
+        run: pip3 install pretalx
+      - name: Install Dependencies
+        run: pip3 install black -Ue .
+      - name: Run black
+        run: black --check .
+        working-directory: .
   docformatter:
     name: docformatter
     runs-on: ubuntu-latest

setup.cfg

@@ -1,10 +1,22 @@
 [isort]
-balanced_wrapping = True
-combine_as_imports = True
+multi_line_output = 3
+include_trailing_comma=True
+force_grid_wrap=0
+use_parentheses=True
+line_length=88
+skip = migrations,setup.py
 default_section = THIRDPARTY
-include_trailing_comma = True
 known_third_party = pretalx
-line_length = 80
-multi_line_output = 5
-not_skip = __init__.py
-skip = migrations,setup.py
+
+[tool:pytest]
+DJANGO_SETTINGS_MODULE=pretalx.common.settings.test_settings
+
+[check-manifest]
+ignore =
+  LICENSE
+  README.rst
+  tests
+  tests/*
+
+[flake8]
+max-line-length = 120