Ci cd/backend unit testing (#119)

* Added backend unit test workflow

* Changed run command for Unit test step to run test_db.py

* Changed command to python3

* Changed from pep8 to pycodestyle

.github/workflows/backend-test.yml

@@ -0,0 +1,35 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
+
+name: Python package
+
+on:
+  pull_request:
+    paths: server/src/**/*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install cherrypy
+      - name: Lint with pycodestyle
+        continue-on-error: true
+        run: |
+          pip install pycodestyle
+          # stop the build if there are Python syntax errors or undefined names
+          pycodestyle ./server
+      - name: Run unit tests
+        run: |
+          python3 server/test_db.py