docs: added new OCI authentication configuration property type

related flipt-io/flipt#2938

configuration/overview.mdx

@@ -268,6 +268,7 @@ export FLIPT_CORS_ALLOWED_ORIGINS="http://localhost:3000 http://localhost:3001"
 | storage.oci.bundles_directory       | The directory in which to store local bundles         | $config/flipt/bundles | v1.31.0 |
 | storage.oci.poll_interval           | The interval to poll the registry for changes         | 30s                   | v1.31.0 |
 | storage.oci.manifest_verison        | The OCI manifest version to use                       | 1.1                   | v1.39.1 |
+| storage.oci.authentication.type     | The type to use for authentication                    | static                | v1.40.0 |
 
 ### Cache
 

configuration/storage.mdx

@@ -504,6 +504,15 @@ See [this issue](https://github.com/flipt-io/flipt/issues/2907) for more informa
 
 </Note>
 
+Starting from version `1.40.0, Flipt offers two authentication methods:
+
+- **Static**: This is the default method that uses a username and password for authentication.
+- **AWS ECR**: If you're using Flipt on AWS with a private ECR repository, you could configure authentication differently.
+  Set either the FLIPT_STORAGE_OCI_AUTHENTICATION_TYPE environment variable or the storage.oci.authentication.type configuration property to `aws-ecr`.
+  Additionally, make sure your compute instance or container has an role with permissions to pull from ECR.
+
+See [this issue](https://github.com/flipt-io/flipt/issues/2938) for more information.
+
 ### Flag State Configuration
 
 Each of Flipt's filesystem backends expects you to represent your feature flag configuration via a set of YAML files.