feat: add zsh image for ncs-zephyr

[MarkoSagadin]

Description

This PR introduces a new ZSH-based Docker image for enhanced developer experience. It adds a new build stage to the existing Dockerfile, creates a ZSH image with additional tools and configurations, and updates the GitHub workflow to build and push this new image.

Areas of interest for the reviewer

Try building and running this image locally.

For that you need to:

git clone https://github.com/IRNAS/irnas-docker-software.git
cd irnas-docker-software
git checkout feature/zsh
cd ncs-zephyr
./build_zsh.sh

# Wait a bit
./run.sh <path to some application's west top directory>

Tell me if you like what you see, check the changes in the Docker file, I have also added my usual aliases.

Checklist

• My code follows the style guidelines as defined by IRNAS.
• I have performed a self-review of my code.
• My changes generate no new warnings.
• I added/updated source code documentation for all newly added or changed functions.
• I updated all customer-facing technical documentation. - This PR mainly affects internal development tools and processes.

After-review steps

Code author will merge the branch

[MarkoSagadin]

• feat: add zsh image for ncs-zephyr #7 👈
• main

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[KajbaM]

This is beautiful!
It brings tear to my eye!
No longer need to deal with path or virtual shell environment?
LIFE CHANGING!
I feel like new man using this Docker image and you should be proud as the author!

IMMACULATE WORK!
This will make my life so much easier, that I will finally potentially maybe turn into somewhat decent developer <3

Thank you!