little bit of ci (#96)

* more pre-commit

* run in ci

* fix violations

* cleanup

.github/workflows/tests.yaml

@@ -0,0 +1,17 @@
+name: tests
+on:
+  push:
+  pull_request:
+
+jobs:
+  precommit:
+    name: pre-commit
+    runs-on: ubuntu-20.04
+    timeout-minutes: 8
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
+      with:
+        python-version: '3.8'
+    - run: 'pip install pre-commit'
+    - run: 'pre-commit run --all'