feat: add /donate page with Stripe embedded checkout and Cloudflare Worker backend

.github/workflows/pages.yml

@@ -72,11 +72,17 @@ jobs:
       #     chmod +x _scripts/thumbnail_sizes.sh
       #     ./_scripts/thumbnail_sizes.sh
 
-      - name: Inject feedback token
+      - name: Inject config secrets
         run: |
+          : "${STRIPE_PUBLIC_KEY:?STRIPE_PUBLIC_KEY secret is not set}"
+          : "${WORKER_URL:?WORKER_URL secret is not set}"
           echo "feedback_token: \"$FEEDBACK_TOKEN\"" >> _config.yml
+          echo "stripe_public_key: \"$STRIPE_PUBLIC_KEY\"" >> _config.yml
+          echo "worker_url: \"$WORKER_URL\"" >> _config.yml
         env:
           FEEDBACK_TOKEN: ${{ secrets.FEEDBACK_TOKEN }}
+          STRIPE_PUBLIC_KEY: ${{ secrets.STRIPE_PUBLIC_KEY }}
+          WORKER_URL: ${{ secrets.WORKER_URL }}
 
       # Outputs to the './_site' directory by default
       - name: Build Jekyll site