Add pre-commit to UCO CI

References:
* casework/CASE-Utilities-Python#37
* #373

.github/workflows/ci.yml

@@ -35,6 +35,10 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Pre-commit Checks
+      run: |
+        pip -q install pre-commit
+        pre-commit run --all-files
     - name: Start from clean state
       run: make clean
     - name: Run tests