Fix traefik rule priority for media router (#4244)

* Add option to serve media files locally using nginx

* Fix nginx media location and storage issue

* Fix traefik django-media typo

* Add certresolver property to web-media-router

* Add trailing slash in nginx configuration to avoid path traversal exploits

* Remove autoindexing from nginx configuration so nginx uses its default off setting

* Use nginx to serve media files if cloud provider is None

* Add back warning about lack of media files without Docker or Cloud providers

* Update documentation

* Fix typos and rephrase

Co-authored-by: Arkadiusz Ryś <arkadiusz.michal.rys@gmail.com>

* Change Traefik media router rule generation to force priority

The web-secure-router could end up having priority over the web-media-router when the www subdomain was used.
This fix adds the www subdomain to the web-media-router if it's also present in the web-secure-router rule.
Traefik looks at the length of rules to determine priority when no explicit priority is set.
The web-media-router needs to always have priority over the web-secure-router in order for the media files to be served.

* Add space to Traefik rule

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Co-authored-by: Bruno Alla <alla.brunoo@gmail.com>
Co-authored-by: Bruno Alla <browniebroke@users.noreply.github.com>

{{cookiecutter.project_slug}}/compose/production/traefik/traefik.yml

@@ -60,7 +60,11 @@ http:
     {%- if cookiecutter.cloud_provider == 'None' %}
 
     web-media-router:
+      {%- if cookiecutter.domain_name.count('.') == 1 %}
+      rule: "(Host(`{{ cookiecutter.domain_name }}`) || Host(`www.{{ cookiecutter.domain_name }}`)) && PathPrefix(`/media/`)"
+      {%- else %}
       rule: "Host(`{{ cookiecutter.domain_name }}`) && PathPrefix(`/media/`)"
+      {%- endif %}
       entryPoints:
         - web-secure
       middlewares: