Move Flake configuration into dedicated file

Avoid passing arguments in the script.

.flake8

@@ -0,0 +1,12 @@
+[flake8]
+# 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
+#   * E203 (whitespace before ':'): Black recommends this as disabled
+ignore = W503, E501
+extend-ignore = E203
+# We exclude the Debian, migrations, and provisioner examples
+exclude = debian,api-daemon/migrations/versions,api-daemon/provisioner/examples
+# Set the max line length to 88 for Black
+max-line-length = 88
+