Bump remaining apps: major version slots and infrastructure

New version slots (major version jumps):
- gitea: 1.24.3 -> 28.2.0 (slot 1 -> 28)
- ghost: 5.130.6 -> 6.72.0 (slot 5 -> 6)
- formbricks: 3.6.0 -> 6.1.0 (slot 3 -> 6)
- mattermost: 10.8.1 -> 12.0.1 (slot 10 -> 12)
- zulip: 9.4 -> 12.3 (slot 9 -> 12)
- immich: 1.135.3 -> 3.3.5 (slot 1 -> 3)
- openproject: 16.1.1 -> 17.9.3 (slot 16 -> 17)
- listmonk: 5.0.3 -> 6.1.0 (slot 5 -> 6)
- discourse: 3.5.3 -> 2026.10.0 (slot 3 -> 2026, calver)

Same-slot large bumps:
- vllm: 0.9.2 -> 0.32.0
- longhorn: v1.8.1 -> v1.13.0

Infrastructure:
- cert-manager: v1.17.2 -> v1.21.2
- coredns: v1.12.0 -> v1.14.7
- externaldns: v0.13.4 -> v0.23.0
- metallb: v0.15.0 -> v0.16.1
- mysql: 9.1.0 -> 9.7.4
- node-feature-discovery: v0.17.3 -> v0.20.1
- nvidia-device-plugin: v0.17.1 -> v0.20.1

formbricks/versions/6/README.md

@@ -0,0 +1,36 @@
+# Formbricks
+
+Formbricks is an open-source survey and feedback platform for building in-app microsurveys, NPS scores, and user research forms.
+
+## Dependencies
+
+- **PostgreSQL** - Database for storing surveys and responses
+- **Redis** - Used for caching and background jobs
+
+## Configuration
+
+Key settings in `config.yaml`:
+
+- **domain** - Where Formbricks will be accessible
+- **storage** - Persistent volume size (default: `2Gi`)
+- **db.name** - Database name (default: `formbricks`)
+
+## First-Time Setup
+
+1. Add and deploy the app:
+   ```bash
+   wild app add formbricks
+   wild app deploy formbricks
+   ```
+
+2. Visit the app URL and sign up to create your admin account.
+
+3. The first user to sign up becomes the organization owner.
+
+4. Create your first survey from the dashboard and embed it in your apps using the provided JavaScript snippet.
+
+## Notes
+
+- Formbricks can be embedded in web apps or used as a standalone survey link
+- The `nextauthSecret` and `encryptionKey` are auto-generated in `secrets.yaml`
+- The `cronSecret` secures the internal cron endpoint used for scheduled tasks