[dashboard] Introduce VNC console - #1627

Walkthrough

This PR adds VNC tab functionality to the dashboard factory for VirtualMachine and VMInstance resources, updates Docker build dependencies to new commits, and enhances nginx proxy configuration with HTTP 1.1 support and additional headers/timeouts for improved websocket and long-connection handling.

Changes

Sequence Diagram

sequenceDiagram
    participant ensureFactory as ensureFactory()
    participant vncTabPrefix as vncTabPrefix(kind)
    participant vncTab as vncTab(prefix)
    participant tabs as tabs array

    ensureFactory->>vncTabPrefix: check CRD kind
    alt VirtualMachine or VMInstance
        vncTabPrefix-->>ensureFactory: return prefix, true
        ensureFactory->>vncTab: construct VNC tab config
        vncTab-->>ensureFactory: return tab object
        ensureFactory->>tabs: append VNC tab
    else Other kinds
        vncTabPrefix-->>ensureFactory: return "", false
        ensureFactory->>tabs: skip VNC tab
    end

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Factory.go: Review the new vncTabPrefix() mapping logic and vncTab() structure to ensure correct field references and formatting, particularly the namespace path and VM name construction.
• Dockerfile: Verify the new commit hashes are valid and intended; check upstream repository to confirm changes.
• Nginx config: Validate timeout values (86400s) and header additions align with intended websocket/long-connection behavior.

Possibly related PRs

• [dashboard] Update openapi-ui v1.0.3 + fixes #1564: Modifies ensureFactory() in the same file; previous changes made YAML editor read-only while this PR adds VNC tab logic.

Suggested reviewers

• nbykov0

Poem

🐇 A VNC tab hops into view,
Websockets whisper through tunnels true,
Headers dance with timeouts long,
Dashboard magic, steady and strong! ✨

Pre-merge checks and finishing touches

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