Skip GPU detection test in GitHub Actions

[Copilot]

The GPU detection test fails in CI because lspci is unavailable in GitHub Actions runners.

Changes

• Wrap GPU detection test with GITHUB_ACTIONS === false conditional
• Test now skips in CI, runs locally where GPU info is accessible
• Follows existing pattern used for other environment-specific tests (apache2, file size checks)

// Before: unconditional test
it("Detect GPUs on this system", function () {
  let stdout = execSync(
    `MOCHA_ENV=test node ${LOZ_BIN} "Detect GPUs on this system"`,
  ).toString();
  expect(stdout).to.include("VGA compatible controller");
});

// After: conditional on local environment
if (GITHUB_ACTIONS === false) {
  it("Detect GPUs on this system", function () {
    let stdout = execSync(
      `MOCHA_ENV=test node ${LOZ_BIN} "Detect GPUs on this system"`,
    ).toString();
    expect(stdout).to.include("VGA compatible controller");
  });
}

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