Release book to S3 (#38)

This will automatically release the book to S3 after merging pull
requests

.github/workflows/validate.yml

@@ -1,23 +1,15 @@
 name: Validate LaTeX Document
-on:
-  pull_request:
-    branches:
-      - main
+on: [ push ]
 jobs:
-  build_latex:
+  test_building_book:
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Git repository
+      - name: Set up git repository
         uses: actions/checkout@v3
-      - name: Build book
+      - name: Test building book
         uses: xu-cheng/texlive-action/full@v1
         with:
           run: |
             apk add make
             cd book
-            make all
-      - name: Upload PDF
-        uses: actions/upload-artifact@v3
-        with:
-          name: PDF
-          path: book/book.pdf
+            make all