Setup CI for tests

.github/workflows/main.yaml

@@ -0,0 +1,18 @@
+name: linkding CI
+
+on: [push]
+
+jobs:
+  run_tests:
+    name: Run Django Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+      - name: Install dependencies
+        run: pip install -r requirements.txt
+      - name: Run tests
+        run: python manage.py test