ci: add code linting and formatting workflow (#12)

* ci: add code linting and formatting workflow

* fix node cache dependency path

* install pipenv

* specify node v20 to try to suppress warning

.github/workflows/lint.yaml

@@ -0,0 +1,49 @@
+name: Formatting and Linting
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Python setup
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+          cache: pipenv
+          cache-dependency-path: app/backend/Pipfile.lock
+
+      - name: Install pipenv
+        run: pip install pipenv
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Node setup and cache
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+          cache-dependency-path: app/frontend/pnpm-lock.yaml
+
+      - name: Install development dependencies
+        run: cd app && make devinstall
+
+      - name: Check code formatting and linting
+        run: cd app && make devlintcheck

app/Makefile

@@ -11,6 +11,12 @@ devlock:
 	@cd backend && pipenv lock && pipenv sync -d && pipenv clean
 	@cd frontend && pnpm install
 
+# [DEV] Install development dependencies on the host machine based on the lock
+# files without modifying them
+devinstall:
+	@cd backend && pipenv sync -d
+	@cd frontend && pnpm install --frozen-lockfile
+
 # [DEV] Format and lint the codebase
 devlint:
 	@cd backend && pipenv run bash -c "black . && ruff check --select I --fix . && ruff format . && mypy ."