ENH run flake8 job on PRs from forks (#236)

Author: mathurinm

.github/workflows/flake8.yml

@@ -1,6 +1,13 @@
 name: linter
 
-on: push
+on:
+  push:
+    branches:
+      - 'main'
+  pull_request:
+    branches:
+      - 'main'
+
 
 jobs:
   lint:

celer/tests/test_logreg.py

@@ -4,7 +4,7 @@
 import numpy as np
 from numpy.linalg import norm
 
-from numpy.testing import assert_allclose, assert_array_less, assert_array_equal
+from numpy.testing import assert_allclose, assert_array_less
 from sklearn.linear_model._logistic import _logistic_regression_path
 from sklearn.utils.estimator_checks import check_estimator
 from sklearn.linear_model import LogisticRegression as sklearn_Logreg

celer/tests/test_mtl.py

@@ -1,5 +1,4 @@
 import pytest
-import warnings
 import itertools
 
 import numpy as np