Wrangler: Prepare the deploy to v3-12.rabbitmq.com

[Why]
The current website will be replaced by a Docusaurus-base new website
that supports docs versioning. The new website will cover RabbitMQ
versions starting with 3.13.0.

We want to keep a copy of the docs of RabbitMQ 3.12.x. Therefore, we
want to publish what was the `live` branch to v3-12.rabbitmq.com.

[How]
The method remains the same: we use Cloudflare's Wrangler to deploy the
generated static website to a Cloudflare worker.

.github/workflows/publish-live.yml → .github/workflows/publish-website.yml

@@ -1,9 +1,9 @@
-name: Publish Live Website
+name: Publish website - 3.12
 
 on:
   push:
     branches:
-      - live
+      - v3.12.x
   workflow_dispatch:
 
 jobs:
@@ -13,7 +13,7 @@ jobs:
       image: pivotalrabbitmq/website-packaging
     steps:
       - uses: actions/checkout@v4
-      - name: Generate next website
+      - name: Generate website
         id: generate
         run: |
           mkdir generated

ci/worker/wrangler.toml

@@ -1,8 +1,8 @@
-name = "live"
+name = "rabbitmq-website-v3-12"
 main = "src/index.ts"
 compatibility_date = "2023-10-30"
 workers_dev = true
-routes = ["https://rabbitmq.com/*", "https://www.rabbitmq.com/*", "https://live.rabbitmq.com/*"]
+routes = ["https://v3-12.rabbitmq.com/*"]
 
 [site]
 bucket = "./public"