ci:

   add manual deploy workflow with branch selection

   Adds a new GitHub Action that allows manual deployment from any
   specified branch via workflow_dispatch.

Author: lmammino

.github/workflows/manual-deploy.yml

@@ -0,0 +1,63 @@
+name: Manual Deploy
+
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: 'Branch to deploy'
+        required: true
+        default: 'main'
+        type: string
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: 'pages'
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.branch }}
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: 'pnpm'
+
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v5
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build with Astro
+        run: pnpm build
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./dist
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4