Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
You have to connect a reset line or else use a non default openocd local script (i.e. reset_config srst_nogate) or else override the default in run/debug config with openocd option.