ci(lint): add github action workflow for linting

.github/workflows/client-lint.yml

@@ -0,0 +1,25 @@
+name: Client Lint
+
+on:
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+
+      - name: Install dependencies (client)
+        working-directory: ./client
+        run: yarn install
+
+      - name: Run linter (client)
+        working-directory: ./client
+        run: yarn lint

.github/workflows/server-lint.yml

@@ -0,0 +1,25 @@
+name: Server Lint
+
+on:
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+
+      - name: Install dependencies (server)
+        working-directory: ./server
+        run: yarn install
+
+      - name: Run linter (server)
+        working-directory: ./server
+        run: yarn lint

package.json

@@ -0,0 +1,14 @@
+{
+	"name": "weather-app",
+	"version": "1.0.0",
+	"description": "A simple weather app",
+	"scripts": {
+		"client": "cd client && yarn run dev",
+		"server": "cd server && node --watch server.js",
+		"lint::client": "cd client && yarn run lint",
+        "lint::server": "cd server && yarn run lint",
+        "lint": "yarn run lint::client && yarn run lint::server"
+	},
+	"author": "",
+	"license": "ISC"
+}