feat(configuration/git): add SSH authentication documentation

configuration/overview.mdx

@@ -170,14 +170,18 @@ These properties are as follows:
 
 #### Storage Git
 
-| Property                                  | Description                                                 | Default | Since   |
-| ----------------------------------------- | ----------------------------------------------------------- | ------- | ------- |
-| storage.git.repository                    | The URL of the git repository to use                        |         | v1.25.0 |
-| storage.git.ref                           | The git ref to use                                          | main    | v1.25.0 |
-| storage.git.poll_interval                 | The interval to poll the git repository and ref for changes | 30s     | v1.25.0 |
-| storage.git.authentication.basic.username | The username to use for basic authentication                |         | v1.25.0 |
-| storage.git.authentication.basic.password | The password to use for basic authentication                |         | v1.25.0 |
-| storage.git.authentication.token          | The access token to use for authentication                  |         | v1.25.0 |
+| Property                                                | Description                                                 | Default | Since   |
+| ------------------------------------------------------- | ----------------------------------------------------------- | ------- | ------- |
+| storage.git.repository                                  | The URL of the git repository to use                        |         | v1.25.0 |
+| storage.git.ref                                         | The git ref to use                                          | main    | v1.25.0 |
+| storage.git.poll_interval                               | The interval to poll the git repository and ref for changes | 30s     | v1.25.0 |
+| storage.git.authentication.basic.username               | The username to use for basic authentication                |         | v1.25.0 |
+| storage.git.authentication.basic.password               | The password to use for basic authentication                |         | v1.25.0 |
+| storage.git.authentication.token                        | The access token to use for authentication                  |         | v1.25.0 |
+| storage.git.authentication.ssh.password                 | Password used to generate the SSH keypair                   |         | v1.30.0 |
+| storage.git.authentication.ssh.private_key_path         | Path to private key on the filesystem                       |         | v1.30.0 |
+| storage.git.authentication.ssh.private_key_bytes        | (alternative) raw private key bytes                         |         | v1.30.0 |
+| storage.git.authentication.ssh.insecure_ignore_host_key | Skip verifying the known hosts key (avoid in production)    | false   | v1.30.0 |
 
 #### Storage Object
 

configuration/storage.mdx

@@ -205,7 +205,7 @@ Flipt will follow the configured reference (e.g. branch name) and keep up to dat
 #### Authentication
 
 Authentication enables the ability to leverage private Git repositories as flag state backends.
-The `git` type backend supports both `basic` and `token` based authentication schemes.
+The `git` type backend supports both `basic`, `token` and `ssh` based authentication schemes.
 
 **GitHub**
 
@@ -229,6 +229,33 @@ storage:
         password: < github-personal-access-token >
 ```
 
+**SSH**
+
+In order to configure Flipt with SSH, you will need to generate an SSH key-pair and configure your repository provider with the public key.
+GitHub has some excellent documentation regarding how to generate and install you credentials [here](https://docs.github.com/en/authentication/connecting-to-github-with-ssh).
+
+Once you have your private key credentials you will need to configure Flipt to use them.
+This can be done via the `storage.git.authentication.ssh` configuration section:
+
+```yaml
+storage:
+  type: git
+  git:
+    repository: [email protected]:flipt-io/some-private-repo.git
+    authentication:
+      ssh:
+        password: flipt
+        private_key_path: private-key.pem
+        # private_key_bytes: <raw-key-bytes> # alternatively pass the raw bytes inline
+        insecure_ignore_host_key: true
+```
+
+<Warning>
+`insecure_ignore_host_key` is not encouraged for production use, and is `false` by default.
+Instead, you are advised to put the key fingerprint in the known hosts file where you are running Flipt.
+For example, for Github you can do `ssh-keyscan github.com >> ~/.ssh/known_hosts` on the Flipt host.
+</Warning>
+
 See our [GitOps Guide](/guides/get-going-with-gitops) for an example of how to set up a GitHub repository as a flag state backend.
 
 ### Object