build and deploy ePub e-book files

Author: das-g

.github/workflows/deploy.yml

@@ -23,10 +23,15 @@ jobs:
         uses: actions/checkout@v3
         with:
           persist-credentials: false
+      - uses: awalsh128/cache-apt-pkgs-action@v1
+        with:
+          packages: calibre
       - name: Install and Build
         run: |
           npm install
           npx honkit build
+          npx honkit epub
+          mv book_*.epub _book/
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v1
         with: