base: Add nrf-regtool to the list of Python packages installed

After a discussion in Discord
(https://discord.com/channels/720317445772017664/1196766845332619305/1196766847962464276)
we concluded that there is no easy way of adding vendor-specific Python
packages that are required to be executed during the build but should
not be present in the standard requirements-*.txt files since they are
specific to a single vendor.

For now solve the issue by including the package by name in the Docker
file, to have the package available for the PR that introduced the first
IC that requires this package, the nRF54H20 (zephyrproject-rtos/zephyr#68043).

Signed-off-by: Carles Cufi <[email protected]>

Dockerfile.base

@@ -113,7 +113,8 @@ RUN python3 -m pip install -U --no-cache-dir pip && \
 		-r https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/main/scripts/requirements.txt \
 		-r https://raw.githubusercontent.com/zephyrproject-rtos/mcuboot/main/scripts/requirements.txt \
 		GitPython imgtool junitparser numpy protobuf PyGithub \
-		pylint sh statistics west && \
+		pylint sh statistics west \
+		nrf-regtool && \
 	pip3 check
 
 # Clean up stale packages