docs: add landscape integration

docs/integrations/services/ubuntu-landscape/index.md

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+# Ubuntu Landscape Integration
+
+## What is Ubuntu Landscape
+
+From https://en.wikipedia.org/wiki/Landscape_(software)
+
+!!! note ""
+
+    Landscape is a systems management tool developed by Canonical. It can be run on-premises or in the cloud depending on the needs of the user. It is primarily designed for use with Ubuntu derivatives such as Desktop, Server, and Core.
+
+!!! warning
+
+    This requires passbook 0.10.3 or newer.
+
+## Preparation
+
+The following placeholders will be used:
+
+ - `landscape.company` is the FQDN of the Landscape server.
+ - `passbook.company` is the FQDN of the passbook install.
+
+Landscape uses the OpenID-Connect Protocol for single-sign on.
+
+## passbook Setup
+
+Create an OAuth2/OpenID-Connect Provider with the default settings. Set the Redirect URIs to `https://landscape.company/login/handle-openid`. Select all Autogenerated Scopes.
+
+Keep Note of the Client ID and the Client Secret.
+
+Create an application and assign access policies to the application. Set the application's provider to the provider you've just created.
+
+## Landscape Setup
+
+On the Landscape Server, edit the file `/etc/landscape/service.conf` and add the following snippet under the `[landscape]` section:
+
+```
+oidc-issuer = https://passbook.company/application/o/<slug of the application you've created>/
+oidc-client-id = <client ID of the provider you've created>
+oidc-client-secret = <client Secret of the provider you've created>
+```
+
+Afterwards, run `sudo lsctl restart` to restart the Landscape services.
+
+## Appendix
+
+To make an OpenID-Connect User admin, you have to insert some rows into the database.
+
+First login with your passbook user, and make sure the user is created successfully.
+
+Run `sudo -u postgres psql landscape-standalone-main` on the Landscape server to open a PostgreSQL Prompt.
+Then run `select * from person;` to get a list of all users. Take note of the ID given to your new user.
+
+Run the following commands to make this user an administrator:
+
+```sql
+INSERT INTO person_account VALUES (<user id>, 1);
+INSERT INTO person_access VALUES (<user id>, 1, 1);
+```