CI: Add code checks to MR

.github/workflows/pr.yaml

@@ -0,0 +1,12 @@
+name: Check MR
+
+on: [pull_request]
+
+jobs:
+  mypy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: pkgxdev/setup@v1
+      - run: pkgx +task task check:mypy

toogoodtogo_ha_mqtt_bridge/tests/test_cron.py

@@ -16,7 +16,7 @@
         ("2022-11-12 20:54:44", "*/10 7-20 * * *", "2022-11-13 07:00:00"),
     ],
 )
-def test_calc_next_run(_time, _cron, expected):
+def test_calc_next_run(_time, _cron, expected) -> None:
     expected_date = dt.datetime.strptime(expected, "%Y-%m-%d %H:%M:%S")
     time_date = dt.datetime.strptime(_time, "%Y-%m-%d %H:%M:%S")