fix: replace hardcoded GA tracking ID with environment variable

.env.example

@@ -0,0 +1,6 @@
+# Google Analytics Tracking ID
+# For local development, copy this file to `.env` and set your real tracking ID.
+# For GitHub Actions, set `GA_TRACKING_ID` in repository variables (not secrets).
+# Reference: Settings > Secrets and variables > Actions > Variables
+# If deploying on Netlify, configure `GA_TRACKING_ID` in Netlify environment variables separately.
+GA_TRACKING_ID=G-XXXXXXXXXX

.github/workflows/build.yml

@@ -0,0 +1,30 @@
+name: Build Docusaurus
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.14.0'
+          cache: 'yarn'
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Build Docusaurus
+        run: yarn build
+        env:
+          GA_TRACKING_ID: ${{ vars.GA_TRACKING_ID }}

.gitignore

@@ -10,6 +10,7 @@
 
 # Misc
 .DS_Store
+.env
 .env.local
 .env.development.local
 .env.test.local

docusaurus.config.js

@@ -43,10 +43,12 @@ const config = {
           showLastUpdateAuthor: true,
           showLastUpdateTime: true,
         },
-        gtag: {
-          trackingID: "G-854W8PEZ1Z",
-          anonymizeIP: true,
-        },
+        ...(process.env.GA_TRACKING_ID && {
+          gtag: {
+            trackingID: process.env.GA_TRACKING_ID,
+            anonymizeIP: true,
+          },
+        }),
         blog: {
           showReadingTime: true,
           feedOptions: {