Added linting job [no ci]

.github/workflows/linting.yml

@@ -0,0 +1,26 @@
+name: Linting
+
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+    branches:
+      - '*'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v1
+      - name: Set up Python 3.7
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+      
+      - name: Install lint dependencies
+        run: pip install wheel setuptools black==22.3.0 isort==5.10.1 flake8==4.0.1
+
+      - name: Lint the code
+        run: sh shell/lint.sh