Add GitHub Actions CI/CD workflow with branch-specific deployment controls

.github/workflows/main.yml

@@ -0,0 +1,47 @@
+name: CI & CD
+on:
+    push:
+        branches:
+            - '**'
+jobs:
+    Build-and-Deploy:
+        runs-on: ubuntu-latest
+        permissions:
+            contents: write
+        env:
+            VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}
+            VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+            VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
+        steps:
+            - uses: actions/checkout@v4
+
+            - uses: pnpm/action-setup@v4
+              with:
+                  version: 10
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: 22
+                  cache: pnpm
+            - name: Install & Build
+              run: |
+                  pnpm i --frozen-lockfile
+                  pnpm build
+
+            - name: Deploy to GitHub pages
+              uses: peaceiris/actions-gh-pages@v4
+              if: github.ref == 'refs/heads/master'
+              with:
+                  publish_dir: ./dist
+                  personal_token: ${{ secrets.GITHUB_TOKEN }}
+                  force_orphan: true
+
+            - name: Deploy to Vercel
+              uses: amondnet/vercel-action@v25
+              if: ${{ env.VERCEL_TOKEN && env.VERCEL_ORG_ID && env.VERCEL_PROJECT_ID }}
+              with:
+                  vercel-token: ${{ secrets.VERCEL_TOKEN }}
+                  github-token: ${{ secrets.GITHUB_TOKEN }}
+                  vercel-org-id: ${{ secrets.VERCEL_ORG_ID }}
+                  vercel-project-id: ${{ secrets.VERCEL_PROJECT_ID }}
+                  working-directory: ./
+                  vercel-args: ${{ github.ref == 'refs/heads/master' && ' --prod' || '' }}