ci: skip exit code on Mermaid SVG render step for git submodule conflicts

[Copilot]

The render-diagrams workflow fails at step 6 ("Render Mermaid to SVG") with git exit code 128 — caused by orphaned submodule gitlink entries in the index (Networkbuster.net, android/antigravity/app/*, etc.) with no corresponding .gitmodules file, which trips up git operations during the mermaid-cli/Puppeteer process.

Change

• Added continue-on-error: true to the "Render Mermaid to SVG" step so a git-related failure doesn't abort the workflow, allowing subsequent steps (PNG render, artifact upload) to still execute.

- name: Render Mermaid to SVG
  continue-on-error: true
  run: npx -y @mermaid-js/mermaid-cli -i "docs/diagrams/*.mmd" -o docs/diagrams -f svg

Original prompt

https://github.com/NetworkBuster/networkbuster.net/actions/runs/21741091669/job/65452859744#step:6:1 skip exit code for git reasons

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Project	Deployment	Actions	Updated (UTC)
.git	Error		Mar 2, 2026 7:37pm
dashboard	Error		Mar 2, 2026 7:37pm
networkbuster-net	Ready	Preview, Comment	Mar 2, 2026 7:37pm
networkbuster.net	Ready	Preview, Comment	Mar 2, 2026 7:37pm