Add API_PUBLIC_URL environment variable for public API access

- Added API_PUBLIC_URL to deploy-config and manifest.yml
- Updated app config to load API_PUBLIC_URL from environment
- Used API_PUBLIC_URL in CSP configuration for connect-src

app/templates/views/jobs/job.html

@@ -14,7 +14,7 @@
     {% if not job.finished_processing %}
       <p class="max-width-full">This page refreshes automatically to show the latest message activity delivery rates, details, and reports.<br>You can watch it in progress or check back later.</p>
     {% endif %}
-    <div data-job-id="{{ job.id }}" data-feature="{{FEATURE_SOCKET_ENABLED | lower}}" data-host="{{ api_host_name }}">
+    <div data-job-id="{{ job.id }}" data-feature="{{FEATURE_SOCKET_ENABLED | lower}}" data-host="{{ api_public_url }}">
     {% if not job.finished_processing %}
       <div
         data-resource="{{ updates_url }}"