ci: prepare auto deployment

.github/workflows/pages.yml

@@ -0,0 +1,56 @@
+name: Build & deploy
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Prepare bun
+        uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: latest
+
+      - name: Installing
+        run: bun i
+
+      - name: Building project
+        run: bun run build
+
+      - name: Uploading production-ready dist files
+        uses: actions/upload-artifact@v4
+        with:
+          name: production-files
+          path: ./dist
+
+  deploy:
+    name: Deploy
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    if: github.ref == 'refs/heads/main'
+
+    steps:
+      - name: Downloading artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: production-files
+          path: ./dist
+
+      - name: Deploying to gh-pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./dist