Description of Changes

The currently used cosmic-screenshot talks to the XDG Desktop Portal to capture the screen.
This works fine for normal user interaction, but can sometimes cause hangups in test automation due to the portal sometimes asking for permission to capture the screen.

We add grim here as a CLI alternative, which talks to the Wayland compositor directly to capture the screen.
To mimic cosmic-screenshot screenshot output as a normal logged in user, one can run:

grim "$XDG_PICTURES_DIR/Screenshot_$(date '+%Y-%m-%d_%H_%M_%S').png"

Type of Change

• New Feature
• Bug Fix
• Improvement / Refactor

Related Issues / Tickets

https://jira.tii.ae/browse/SSRCSP-7876

Checklist

• Clear summary in PR description
• Detailed and meaningful commit message(s)
• Commits are logically organized and squashed if appropriate
• Contribution guidelines followed
• Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• Author has run make-checks and it passes
• All automatic GitHub Action checks pass - see actions
• Author has added reviewers and removed PR draft status

Testing Instructions

Applicable Targets

• Orin AGX aarch64
• Orin NX aarch64
• Lenovo X1 x86_64
• Dell Latitude x86_64
• System 76 x86_64

Installation Method

• Requires full re-installation
• Can be updated with nixos-rebuild ... switch
• Other:

Test Steps To Verify:

N/A