implement basic testing fixtures and linting

.gitea/workflows/backend_run-lint.yaml

@@ -0,0 +1,27 @@
+on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - backend/**
+
+name: Run linting on the backend code
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+
+    - uses: https://gitea.com/actions/checkout@v4
+
+    - name: Install dependencies
+      run: |
+        apt-get update && apt-get install -y python3 python3-pip
+        # only install dev-packages
+        pipenv install --categories=dev-packages
+      working-directory: backend
+
+    - name: Run linter
+      run: pipenv run pylint src
+      working-directory: backend

.gitea/workflows/backend_run-test.yaml

@@ -0,0 +1,27 @@
+on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - backend/**
+
+name: Run linting on the backend code
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+
+    - uses: https://gitea.com/actions/checkout@v4
+
+    - name: Install dependencies
+      run: |
+        apt-get update && apt-get install -y python3 python3-pip
+        # install all packages, including dev-packages
+        pipenv install --dev
+      working-directory: backend
+
+    - name: Run linter
+      run: pipenv run pytest src
+      working-directory: backend