docs: Add Caligra Workbench to adopters list

Signed-off-by: Ziad Khouri <ziad@caligra.com>

Author: ziadkhouri

ADOPTERS.md

@@ -10,6 +10,7 @@
 Vendor | Red Hat | 2024 | https://redhat.com | Image Based Linux 
 Vendor | HeliumOS | 2024 | https://www.heliumos.org/ | An atomic desktop operating system for your devices
 Vendor | AlmaLinux (Atomic SIG) | 2025 | [atomic-desktop](https://github.com/AlmaLinux/atomic-desktop), [atomic-workstation](https://github.com/AlmaLinux/atomic-workstation) | Atomic AlmaLinux desktop respins
+Vendor | Caligra | 2025 | [workbench](https://caligra.com/workbench/) | An OS designed to accelerate knowledge work
 Vendor | CIQ | 2026 | https://ciq.com | Rocky Linux from CIQ (RLC) - Image Based Linux - Standard and Cloud variants
 
 # bootc Adopters (indirect, via ostree)