Fix npm optional dependencies not installed from cache in CI

[Copilot]

Build Server workflow failing with Cannot find module @rollup/rollup-linux-x64-gnu. Known npm bug (npm/cli#4828): optional dependencies aren't installed when npm ci restores from cache.

Changes

• Add --include=optional flag to npm ci in affected workflows:
  • build-server.yml
  • copilot-setup-steps.yml
  • release.yml (2 instances)

- name: Build Server - Install dependencies
  run: npm ci --include=optional
  working-directory: .

Rollup's platform-specific native bindings are optional dependencies. Without the flag, vitest coverage fails since it depends on rollup.

Original prompt

Fix the failing GitHub Actions workflow Build Server
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 62905795915
Job URL: https://github.com/advanced-security/codeql-development-mcp-server/actions/runs/21804627557/job/62905795915

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