ci: add GitHub Pages deployment workflow

Adds a new GitHub workflow for automatically deploying the webui to
GitHub Pages when changes are pushed to the gh-pages branch.

Issue: BTC-0

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger

.github/workflows/deploy-pages.yaml

@@ -0,0 +1,93 @@
+name: "Deploy to GitHub Pages"
+
+on:
+  push:
+    branches:
+      - gh-pages
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+env:
+  RUST_TOOLCHAIN: nightly-2025-10-23
+  NODE_VERSION: 20
+  NPM_VERSION: 11.5.1
+  WASM_PACK_VERSION: 0.13.1
+  WASM_OPT_VERSION: 0.116.1
+
+jobs:
+  build:
+    name: "Build"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # v1
+        with:
+          toolchain: ${{ env.RUST_TOOLCHAIN }}
+          components: rustfmt, clippy
+
+      - name: Cache Rust dependencies
+        uses: Swatinem/rust-cache@f13886b937689c021905a6b90929199931d60db1 # v2.8.1
+        with:
+          workspaces: |
+            packages/wasm-utxo
+            packages/wasm-bip32
+            packages/wasm-solana
+          cache-on-failure: true
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+
+      - name: Install npm and wasm tools
+        run: |
+          npm install -g npm@${{ env.NPM_VERSION }}
+          cargo install wasm-pack --version ${{ env.WASM_PACK_VERSION }}
+          cargo install wasm-opt --version ${{ env.WASM_OPT_VERSION }}
+
+      - name: Build Info
+        run: |
+          echo "node $(node --version)"
+          echo "npm $(npm --version)"
+          echo "rustc $(rustc --version)"
+          echo "wasm-pack $(wasm-pack --version)"
+          echo "wasm-opt $(wasm-opt --version)"
+
+      - name: Install Packages
+        run: npm ci --workspaces --include-workspace-root
+
+      - name: Build packages
+        run: npm --workspaces run build
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: packages/webui/dist
+
+  deploy:
+    name: "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