Update Python workflow

Author: lqmanh

.github/workflows/ci-python.yml

@@ -1,20 +1,28 @@
 name: CI (Python)
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: [3.7, 3.8, 3.9]
     steps:
-      - name: Checkout
+      - name: Check out
         uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install Poetry
+        uses: abatilo/actions-poetry@v2.1.2
       - name: Cache Pip
         uses: actions/cache@v2
         with:
@@ -24,9 +32,6 @@ jobs:
             ${{ runner.os }}-pip-
             ${{ runner.os }}-
       - name: Install dependencies
-        run: |
-          pip install poetry
-          poetry install
+        run: poetry install
       - name: Test with Pytest
-        run: |
-          poetry run pytest
+        run: poetry run pytest