Add doc for self-signed certificates

docs/configuring-playbook-ssl-certificates.md

@@ -29,6 +29,45 @@ devture_traefik_config_entrypoint_web_secure_enabled: false
 
 ## Using self-signed SSL certificates
 
-Using self-signed certificates with Traefik is a somewhat involved processes, where you need to manually mount the files into the container and adjust the "static" configuration to refer to them.
+To use self-signed SSL certificates, you need to disable the certResolvers and the traefik-certs-dumper tool. 
+You also need to override the providers.file setting in the Traefik configs. 
+Create a file 'certificates.yml' in /devture-traefik/config/ with the following content:
 
-Feel free to research this approach on your own and improve this guide!
+```yaml
+tls:
+  certificates:
+    - certFile: /ssl/cert.pem
+      keyFile: /ssl/privkey.pem
+  stores:
+    default:
+      defaultCertificate:
+        certFile: /ssl/cert.pem
+        keyFile: /ssl/privkey.pem
+```
+
+Place the key and your certificate in /devture-traefik/ssl/
+You can use the matrix-aux role for this:
+
+```yaml
+matrix_aux_file_definitions:
+ - dest: /devture-traefik/ssl/privkey.pem
+   src: /path/to/privkey.pem
+ - dest: /devture-traefik/ssl/cert.pem
+   src: /path/to/cert.pem
+ - dest: /devture-traefik/config/certificates.yml
+   src: /path/to/certificates.yml
+```
+
+Then add the following to your vars.yml:
+
+```yaml
+devture_traefik_config_certificatesResolvers_acme_enabled: false
+devture_traefik_certResolver_primary: ''
+devture_traefik_ssl_dir_enabled: true
+devture_traefik_configuration_extension_yaml: |
+  providers:
+    file:
+      filename: /config/certificates.yml
+      watch: true
+matrix_playbook_traefik_certs_dumper_role_enabled: false
+```