Add Github workflows

These should do the checks for us.
Not an expert though so it may need a bit of tweaking before they do
what we want them to do.

.github/workflows/pylint.yml

@@ -0,0 +1,27 @@
+name: pylint
+on:
+  push:
+    paths:
+      - '**/*.py'
+      - '.pylintrc'
+      - '!third_party/**'
+jobs:
+  pylint:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip setuptools wheel
+          pip install tockloader
+      - name: Test code with pylint
+        run: |
+          pip install pylint
+          pylint --rcfile=.pylintrc