Remove test alias from setup.cfg

Configure flake8 in pyproject.toml instead.
Flake8-pyproject is needed as flake8 does not support pyproject.toml
out of the box.

.github/workflows/build.yml

@@ -189,7 +189,6 @@ jobs:
         mkdir tmp_tests
         mv tests tmp_tests/tests
         mv test-data tmp_tests/test-data
-        mv setup.cfg tmp_tests/setup.cfg
         mkdir tmp_tests/.git
 
     - name: Test docs

pyproject.toml

@@ -37,3 +37,18 @@ include = '(\.pyi?|\.ipynb|\.py\.j2)$'
 
 [tool.setuptools_scm]
 write_to = "src/ert/shared/version.py"
+
+[tool.flake8]
+per-file-ignores = [
+    # Ignore all protobuf v2 files
+    "*_pb2.py: E"
+]
+ignore = [
+    # whitespace before ':', solved by black:
+    "E203",
+    # line break before binary operator, solved by black:
+    "W503",
+    # The minimal set of ignores that makes flake8 pass when flake8-bugbear is installed:
+    "B019"
+]
+max-line-length = 88

style-requirements.txt

@@ -2,6 +2,7 @@ cmake-format
 flake8
 flake8-bugbear
 flake8-simplify
+Flake8-pyproject
 isort
 pylint
 pylint-protobuf