Move Flake configuration into dedicated file

Avoid passing arguments in the script.

lint

@@ -4,13 +4,7 @@ if ! which flake8 &>/dev/null; then
     exit 1
 fi
 
-# We ignore the following errors:
-#   * W503 (line break before binary operator): Black moves these to new lines
-#   * E501 (line too long): Long lines are a fact of life in comment blocks; Black handles active instances of this
-flake8 \
-    --ignore=W503,E501 \
-    --exclude=debian,api-daemon/migrations/versions,api-daemon/provisioner/examples \
-    --max-line-length=88
+flake8
 ret=$?
 if [[ $ret -eq 0 ]]; then
     echo "No linting issues found!"