Add app config guide

docs/app-config-guide.md

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+---
+title: Application config guide
+---
+
+# Keycloak
+
+## How do I setup a custom theme?
+
+Check [this approach](https://git.autonomic.zone/ruangrupa/login.lumbung.space).
+
+# Nextcloud
+
+## How do I customise the default home page when logging in?
+
+- Delete the dashboard app since it is so corporate
+- Follow [these docs](https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/default_files_configuration.html) to set the default files list for each user in the Files app
+- Configure a `defaultapp` in your `config.php` or use [apporder](https://apps.nextcloud.com/apps/apporder)
+
+## How do I integrate with Keycloak SSO?
+
+Use [this plugin](https://github.com/pulsejet/nextcloud-oidc-login). You can use [this trick](https://janikvonrotz.ch/2020/10/20/openid-connect-with-nextcloud-and-keycloak/) (see "Cryptic Usernames" work-around) to get proper usernames.
+
+> TODO(decentral1se): copy over keycloak client config and nextcloud config.php
+
+## Why is my synchronisation client freezing on the "grant access" step?
+
+Please see [this ticket](https://git.autonomic.zone/coop-cloud/nextcloud/issues/5).
+
+## How can I customise the CSS on the NC?
+
+There is some basic stuff in the admin settings.
+
+To go a little deeper, you can use [this handy app](https://apps.nextcloud.com/apps/theming_customcss).
+
+## Drone
+
+## Generating deploy keys
+
+We normally do something like the following.
+
+```bash
+$ ssh-keygen -t ed25519 -C drone@swarm.autonomic.zone
+```
+
+When you're loading them into Drone, make sure to use the right name of the organisation when using `drone orgsecret add`.
+
+## How to change orgsecret values
+
+First, get your Drone CLI tool downloaded and the environment configured.
+
+```bash
+$ export DRONE_SERVER=https://drone.example.com
+$ export DRONE_TOKEN=$(pass show your-pass-store-path)
+$ curl -L https://github.com/drone/drone-cli/releases/latest/download/drone_linux_amd64.tar.gz | tar zx
+```
+
+Then you can do things like:
+
+```
+$ ./drone orgsecret ls
+$ ./drone orgsecret add someorg my_deploy_key @my_private_key_file
+```
+
+## How to enable build failure notifications
+
+Add this to your `.drone.yml` file. See the [plugin docs](http://plugins.drone.io/drone-plugins/drone-slack/) for more.
+
+```yaml
+- name: notify rocket chat
+  image: plugins/slack
+  depends_on: ["mybuild"]
+  settings:
+    webhook:
+      from_secret: rc_builds_url
+    username: foobar
+    channel: "builds"
+    template: "{{repo.owner}}/{{repo.name}} build failed: {{build.link}}"
+  when:
+    status:
+      - failure
+```
+
+!!! warning
+
+    You must include valid names of pipelines in your `depends_on` list field.
+    This is so that the notification will wait until all other pipelines are
+    run before performing the notification logic.
+
+## Skipping CI builds
+
+Add `[ci skip]` into the git commit message. You don't have to run builds if you don't want to.
+
+# Gitea
+
+> TODO
+
+# Peertube
+
+## How do I wire up Keycloak SSO?
+
+Use [this plugin](https://framagit.org/framasoft/peertube/official-plugins/tree/master/peertube-plugin-auth-openid-connect).
+
+## How do I develop a custom theme?
+
+See [this approach](https://git.autonomic.zone/ruangrupa/peertube-plugin-lumbung-space).