simplify CI

.github/workflows/build-and-test.yml

@@ -1,16 +1,15 @@
 
 name: Unit Tests
 
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
+on: [pull_request]
+
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
+      fail-fast: false
 
     services:
       sqldb:
@@ -25,17 +24,13 @@ jobs:
         options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
 
     steps:
-      - uses: actions/checkout@v1
-      - name: Set up Python 3.10.2
-        uses: actions/setup-python@v1
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
         with:
-          python-version: 3.10.2
-      - name: Install pipenv
-        run: pip install pipenv --upgrade
-      - name: Upgrde pip, setuptools and wheel
-        run: pip install --upgrade pip setuptools wheel
+          python-version: ${{ matrix.python-version }}
       - name: Install required libs
-        run: pipenv install --system --sequential --ignore-pipfile --dev
+        run: pip install -r requirements.txt
       - name: Run tests
         run: pytest
         env: