Use black for .py files formatting

Signed-off-by: anipaul2 <[email protected]>

.github/workflows/build.yaml

@@ -46,4 +46,15 @@ jobs:
           cargo fmt --verbose --check -- --color always
       - name: Run clippy
         run: |
-          cargo clippy --all-features --all-targets --color always -- --deny warnings
+          cargo clippy --all-features --all-targets --color always -- --deny warnings
+          
+  python-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v3
+      - name: Run black
+        uses: psf/black@stable
+        with:
+          src: "./watchtower-plugin/tests"
+          options: "--check -l 120"