Add linting action

.flake8

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+[flake8]
+exclude = */migrations
+extend-ignore =
+    # "Celery tasks should have explicit names." isn't very well implemented at this time (4/19/2020)
+    PIE783
+    # False positive in flake8-pie 0.7 (2021-04-15)
+    PIE795
+    PIE798
+    PIE803
+    # Print found
+    T201
+
+    # Logging statement uses string.format()
+    G001
+    # Logging statement uses '%'
+    G002
+    # Logging statement uses '+'
+    G003
+    # Logging statement uses f-string (Same as PIE803)
+    G004
+
+# This is used by flake8-import-order
+import-order-style = pycharm
+application-import-names = accounts, apiv2, bookmarks, clustering, comments, donations, favorites, follow, forum, freesound, general, geotags, messages, monitor, ratings, search, similarity, sounds, support, tags, tickets, utils, wiki
+# This is used by flake8-requirements
+known-modules = 
+max-line-length = 170
+
+# This is used by flake8-annotations so that we don't have to explicitly type None in functions that don't use it
+suppress-none-returning = true

.github/workflows/python-flake8.yml

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+name: Flake8
+# https://gitlab.com/pycqa/flake8
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.9'
+      - name: Lint with flake8
+        run: |
+          pip -q install -r requirements.linters.txt
+          # stop the build if there are Python syntax errors or undefined names
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          # These are just the style issues
+          flake8 . --count --statistics

requirements.linters.txt

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+dlint
+flake8
+flake8-bandit
+flake8-bugbear
+flake8-builtins
+flake8-debugger
+flake8-django
+flake8-eradicate
+flake8-import-order
+flake8-logging-format
+flake8-mutable
+flake8-pie
+flake8-print
+flake8-requirements
+flake8-use-fstring