Feat(tests) add lint in ci

.github/workflows/lint.yml

@@ -0,0 +1,13 @@
+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+  backend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Backend code formatting check (Black)
+        uses: psf/black@stable
+        with:
+          src: "./src"

pyproject.toml

@@ -0,0 +1,17 @@
+[tool.pytest.ini_options]
+minversion = "6.0"
+testpaths = [
+    "src",
+]
+
+[tool.coverage.run]
+source = [
+    "mtd_sync",
+]
+omit = [
+    "*/tests/*",
+    "*/migrations/*",
+]
+
+[tool.black]
+line-length = 99