docs: add Proxmox VE LXC install guide and update CI ignore paths

- Add wiki/Install-Proxmox.md with full install/update/log instructions
- Add Proxmox VE section to wiki/Updating.md
- Add Install: Proxmox VE (LXC) to wiki/_Sidebar.md
- Add "Proxmox Community Script" option to bug report install dropdown
- Exclude GitHub meta files from triggering Docker CI workflow

wiki/Updating.md

@@ -44,6 +44,25 @@ If you are upgrading from a version that predates the dedicated `ENCRYPTION_KEY`
 
 If you want to rotate to a new key at any point (not required for a normal update), see [Encryption-Key-Rotation](Encryption-Key-Rotation) for the full procedure.
 
+## Proxmox VE (LXC)
+
+If you installed TREK via the [Proxmox VE Community Scripts](https://community-scripts.org/scripts/trek), run the following command inside the **LXC container** and select **Update** when prompted:
+
+```bash
+bash -c "$(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/ct/trek.sh)"
+```
+
+> **Tip:** Always check the [community-scripts TREK page](https://community-scripts.org/scripts/trek) to confirm the latest command before running.
+
+The script stops the service, backs up your data and uploads, applies the new release, restores the backup, and restarts. No manual steps required.
+
+To verify the update completed and check for errors:
+
+```bash
+# Inside the container (pct enter <id> from the Proxmox shell)
+journalctl -u trek -n 50
+```
+
 ## Unraid
 
 In the Unraid Docker tab, click the TREK container and select **Update**. Unraid will pull the latest image and restart with the same volumes.