Add workflow to build and test before merging to main (#7)

.github/workflows/main.yaml

@@ -0,0 +1,45 @@
+name: Build and run tests
+
+# Controls when the action will run.
+on:
+  # Triggers the workflow on push events for the main branch
+  push:
+    branches: [ main ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python 3.6.8
+        uses: actions/setup-python@v3
+        with:
+          python-version: 3.6.8
+
+      - name: Check package build
+        run: |
+          python -m pip install --upgrade pip
+
+  test:
+    runs-on: ubuntu-20.04
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-python@v3
+        with:
+          python-version: 3.6.8
+          cache: 'pip'
+
+      - name: Install Python dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+
+      - name: Run pytest
+        run: |
+          pytest -v