website/docs: Add Kubernetes Bootstrap Instructions (goauthentik#9541)

* Add Kubernetes Bootstrap Instructions

Signed-off-by: Zapfmeister <zapfmeister@gmail.com>

* Update website/docs/installation/automated-install.md

Co-authored-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>
Signed-off-by: Zapfmeister <zapfmeister@gmail.com>

* Update website/docs/installation/automated-install.md

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Zapfmeister <zapfmeister@gmail.com>

* Update website/docs/installation/automated-install.md

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Zapfmeister <zapfmeister@gmail.com>

* Update website/docs/installation/automated-install.md

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Zapfmeister <zapfmeister@gmail.com>

* Fix lint

* Update website/docs/installation/automated-install.md

Co-authored-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>
Signed-off-by: Zapfmeister <zapfmeister@gmail.com>

---------

Signed-off-by: Zapfmeister <zapfmeister@gmail.com>
Co-authored-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>
Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>

website/docs/installation/automated-install.md

@@ -23,3 +23,23 @@ Requires authentik 2023.3
 :::
 
 Set the email address for the default `akadmin` user.
+
+## Kubernetes
+
+In the Helm values, set the `akadmin`user password and token:
+
+```text
+authentik:
+  bootstrap_token: test
+  bootstrap_password: test
+```
+
+To store the password and token in a secret, use:
+
+```text
+envFrom:
+ - secretRef:
+     name: _some-secret_
+```
+
+where _some-secret_ contains the environment variables as in the documentation above.