Add codespell support (config, workflow to detect/not fix) and make it fix few typos

.github/workflows/codespell.yml

@@ -0,0 +1,25 @@
+# Codespell configuration is within setup.cfg
+---
+name: Codespell
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Annotate locations with typos
+        uses: codespell-project/codespell-problem-matcher@v1
+      - name: Codespell
+        uses: codespell-project/actions-codespell@v2

billiard/util.py

@@ -219,7 +219,7 @@ def set_pdeathsig(sig):
             libc = ctypes.cdll.LoadLibrary("libc.so.6")
             libc.prctl(PR_SET_PDEATHSIG, ctypes.c_int(sig))
     except Exception as e:
-        raise OSError("An error occured while setting pdeathsig") from e
+        raise OSError("An error occurred while setting pdeathsig") from e
 
 def _eintr_retry(func):
     '''

setup.cfg

@@ -12,3 +12,10 @@ ignore = D102,D104,D203,D105,D213
 
 [metadata]
 license_file = LICENSE.txt
+
+[codespell]
+# Ref: https://github.com/codespell-project/codespell#using-a-config-file
+skip = .git*
+check-hidden = true
+# ignore-regex = 
+ignore-words-list = assertin

t/integration/tests/test_multiprocessing.py

@@ -22,7 +22,7 @@
     from billiard._ext import _billiard
 except ImportError as exc:
     raise pytest.skip(exc)
-# import threading after _billiard to raise a more revelant error
+# import threading after _billiard to raise a more relevant error
 # message: "No module named _billiard". _billiard is not compiled
 # without thread support.
 import threading
@@ -750,7 +750,7 @@ def test_event(self):
         event = self.Event()
         wait = TimingWrapper(event.wait)
 
-        # Removed temporaily, due to API shear, this does not
+        # Removed temporarily, due to API shear, this does not
         # work with threading._Event objects. is_set == isSet
         self.assertEqual(event.is_set(), False)