docs: add rancher integration

docs/integrations/as-sp/rancher/index.md

@@ -0,0 +1,22 @@
+# Rancher Integration
+
+Rancher can authenticate against passbook using SAML.
+
+## Preparation
+
+The following placeholders will be used:
+
+-   `rancher.company` is the FQDN of the Rancher Install
+-   `passbook.company` is the FQDN of the passbook Install
+
+Create an application in passbook and note the slug, as this will be used later. Create a SAML Provider with the following Parameters:
+
+-   `ACS URL`: https://rancher.company/v1-saml/adfs/saml/acs
+-   `Audience`: https://rancher.company/v1-saml/adfs/saml/metadata
+-   `Issuer`: passbook
+
+You can of course use a custom Signing Certificate, and adjust the Assertion Length.
+
+## Rancher
+
+![aaa](./rancher.png)

mkdocs.yml

@@ -16,6 +16,7 @@ nav:
   - Integrations:
       - as Provider:
           - GitLab: integrations/as-sp/gitlab/index.md
+          - Rancher: integrations/as-sp/rancher/index.md
 
 repo_name: "BeryJu.org/passbook"
 repo_url: https://git.beryju.org/BeryJu.org/passbook