Setup GitHub Actions for unittests and PyLint (#24)

Including configuration for Coverage & PyLint

.coveragerc

@@ -0,0 +1,2 @@
+[run]
+omit = */tests/*

.github/workflows/default.yml

@@ -0,0 +1,74 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:latest
+        env:
+          POSTGRES_USER: aimaas
+          POSTGRES_PASSWORD: password
+        ports:
+          - 5432:5432
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Cache pip
+        uses: actions/cache@v2
+        with:
+          # This path is specific to Ubuntu
+          path: ~/.cache/pip
+          # Look to see if there is a cache hit for the corresponding requirements file
+          key: ${{ runner.os }}-pip-${{ hashFiles('backend/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+            ${{ runner.os }}-
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r backend/requirements.txt -r backend/requirements_test.txt
+      - name: Test
+        run: pytest --cov-config=.coveragerc --cov=backend backend/tests
+        env:
+          PG_USER: aimaas
+          PG_PASSWORD: password
+          PG_HOST: localhost
+          PG_PORT: 5432
+          PG_DB: aimaas
+          TEST_PG_USER: aimaas
+          TEST_PG_PASSWORD: password
+          TEST_PG_HOST: localhost
+          TEST_PG_PORT: 5432
+          TEST_PG_DB: aimaas
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Cache pip
+        uses: actions/cache@v2
+        with:
+          # This path is specific to Ubuntu
+          path: ~/.cache/pip
+          # Look to see if there is a cache hit for the corresponding requirements file
+          key: ${{ runner.os }}-pip-${{ hashFiles('backend/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+            ${{ runner.os }}-
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r backend/requirements.txt pylint
+      - name: Lint with PyLint
+        run: |
+          pylint --rcfile=.pylintrc backend