Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
Install host dependencies.
Import toolchain and SDK.
Create, configure, build and manage apps.
Debug STM32.
You can directly download it from the VSCode marketplace
For more details, visit the Zephyr Workbench
I eventually made it work, I also have a Wellon VP-590 EPROM/FLASH programmer, unplugging the usb lead from the Wellon made the ST-link work again. really odd.