Write script to link `nextcloud` SAML auth to `authentik`

[pirate]

When all the containers first come up, there are in an empty clean slate state.

Please write a script that creates whatever config files & db records are needed to point Nextcloud to Authentik for authentication.

The script should live in either nextcloud/bin/link_to_authentik.sh and/or authentik/bin/link_to_nextcloud, whatever you think is best. The script should take the following inputs as environment variables:

• COMPANY_NAME=SelfHostYourTech
• COMPANY_DOMAIN=selfhostyour.tech
• ADMIN_USERNAME=admin
• ADMIN_PASSWORD=<random if not provided>

It should programatically perform the steps described here on the Nextcloud side and the Authentik side:

• https://apps.nextcloud.com/apps/user_saml

• https://docs.goauthentik.io/docs/add-secure-apps/providers/saml/

• ✅ You can write directly to other app's ./<appname>/.env files to apply config to them on their next restart

• ✅ You can add/remove/modify the filesystem and database files directly under ./<appname>/data/...

• ✅ You can start other apps and use use their REST/RPC APIs to configure them

• ❌ The script cannot expect any human interaction or require UI steps

Use these powers wisely.

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Subtasks

• Make sure ./authentik/docker-compose.yml works to spin up a fresh empty autentik server
• Make sure ./nextcloud/docker-compose.yml works to spin up a fresh empty Nextcloud server with the
• Make sure you can access the REST APIs / endpoints / filesystems of both as needed to automate the setup process