update workflow.yml

.github/workflows/workflow.yml

@@ -0,0 +1,21 @@
+name: CI workflow
+
+on:
+  push:
+    branches: 
+      - main
+  pull_request:
+    branches: 
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container: python:3.9-slim
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt