Update files for the matrix-alertmanager-receiver: rename config.yml.j2 to config.yaml.j2 in order to improve consistency

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-alertmanager-receiver.md

@@ -89,7 +89,7 @@ There are some additional things you may wish to configure about the component.
 Take a look at:
 
 - `roles/custom/matrix-alertmanager-receiver/defaults/main.yml` for some variables that you can customize via your `vars.yml` file
-- `roles/custom/matrix-alertmanager-receiver/templates/config.yml.j2` for the component's default configuration. You can override settings (even those that don't have dedicated playbook variables) using the `matrix_alertmanager_receiver_configuration_extension_yaml` variable
+- `roles/custom/matrix-alertmanager-receiver/templates/config.yaml.j2` for the component's default configuration. You can override settings (even those that don't have dedicated playbook variables) using the `matrix_alertmanager_receiver_configuration_extension_yaml` variable
 
 ## Installing
 

roles/custom/matrix-alertmanager-receiver/defaults/main.yml

@@ -218,7 +218,7 @@ matrix_alertmanager_receiver_config_templating_resolved_template: |-
 #
 # For a more advanced customization, you can extend the default (see `matrix_alertmanager_receiver_configuration_extension_yaml`)
 # or completely replace this variable with your own template.
-matrix_alertmanager_receiver_configuration_yaml: "{{ lookup('template', 'templates/config.yml.j2') }}"
+matrix_alertmanager_receiver_configuration_yaml: "{{ lookup('template', 'templates/config.yaml.j2') }}"
 
 matrix_alertmanager_receiver_configuration_extension_yaml: |
   # Your custom YAML configuration for matrix-alertmanager-receiver goes here.