Add GitHub Actions workflow to auto-deploy pkgdown docs

On every push to main, builds the pkgdown site and pushes the output
to BaranziniLab/baranzinilab.github.io under tkoi/. Uses PAGES_PAT
secret for cross-repo write access.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Broccolito

.github/workflows/pkgdown-deploy.yml

@@ -0,0 +1,49 @@
+name: Build and Deploy pkgdown
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout tkoi
+        uses: actions/checkout@v4
+
+      - name: Set up R
+        uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
+
+      - name: Install pandoc
+        uses: r-lib/actions/setup-pandoc@v2
+
+      - name: Install system dependencies
+        run: sudo apt-get install -y libsodium-dev libcurl4-openssl-dev libssl-dev libxml2-dev
+
+      - name: Install R dependencies
+        uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages: |
+            pkgdown
+            any::devtools
+
+      - name: Build pkgdown site
+        run: Rscript -e "pkgdown::build_site()"
+
+      - name: Deploy to baranzinilab.github.io
+        run: |
+          git config --global user.name "github-actions[bot]"
+          git config --global user.email "github-actions[bot]@users.noreply.github.com"
+          git clone https://x-access-token:${{ secrets.PAGES_PAT }}@github.com/BaranziniLab/baranzinilab.github.io.git pages_repo
+          rm -rf pages_repo/tkoi
+          cp -r docs pages_repo/tkoi
+          cd pages_repo
+          git add tkoi/
+          git diff --cached --quiet || git commit -m "Auto-deploy tkoi docs from commit ${{ github.sha }}"
+          git push
+          cd ..
+          rm -rf pages_repo