Fix node/panel image uninstall: avoid brittle parsing

[TaraRostami]

This PR fixes uninstall_node_docker_images() and uninstall_pasarguard_docker_images() by removing brittle parsing of docker images output.
The previous implementation relied on awk '{print $3}', which assumes a stable column layout and can extract the wrong field on newer Docker versions / different CLI formatting, causing docker rmi to fail silently.
The updated implementation uses docker images --format for stable extraction, filters only the intended repo (e.g. pasarguard/node), and skips removing images still used by any container.

Old docker:

New docker:

Summary by CodeRabbit

• Bug Fixes
  • Improved Docker image removal safety: prevents removal of images currently in use by containers.
  • Enhanced error handling with better user messaging for missing images and removal failures.
  • Added pre-removal validation checks and per-image feedback during cleanup operations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Walkthrough

Both pasarguard.sh and pg-node.sh now implement safer Docker image removal by checking image existence, verifying container usage, and providing per-image feedback instead of bulk operations. Pre-removal guards prevent attempts on images currently in use.

Changes

Cohort / File(s)	Summary
Docker Image Uninstall Safety pasarguard.sh, pg-node.sh	Both functions now filter Docker images, guard against empty results, skip images in active use by containers, and report per-image success/failure instead of bulk removal.

Sequence Diagram

sequenceDiagram
    participant User
    participant Script
    participant Docker as Docker CLI
    participant Images as Docker Images
    participant Containers as Docker Containers

    User->>Script: Call uninstall function
    Script->>Docker: Query images with filter
    Docker-->>Script: Return image list
    alt No images found
        Script->>User: Print "images not found"
        Script-->>User: Return early
    else Images exist
        loop For each image
            Script->>Docker: Query containers using image
            Docker->>Containers: Check ancestry
            Containers-->>Docker: Return container list
            Docker-->>Script: Report containers
            alt Image in use
                Script->>User: Report containers blocking removal
            else Image not in use
                Script->>Docker: Remove image
                Docker->>Images: Delete image
                Images-->>Docker: Success/Failure
                Docker-->>Script: Report result
                Script->>User: Print removal status
            end
        end
    end

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 Hop hop, safer skies above,
No more rushing, checks with love,
Container bonds are now respected,
Each image's fate, carefully inspected,
Docker's dance, so wise and bright! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing the uninstall functions to avoid brittle Docker image output parsing by using stable field extraction instead of column-position awk commands.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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