Fix workflow failure when GCP_CREDENTIALS not configured

[Copilot]

The dump-ci-stats workflow fails with SyntaxError: Unexpected end of JSON input when GCP_CREDENTIALS secret is not configured. The script attempts to parse the empty environment variable before validating it exists.

Changes

• Move GCP_CREDENTIALS validation before require() statement to prevent module loading when credentials aren't set
• Exit gracefully (exit code 0) when credentials are empty, unset, or whitespace-only

Before:

const Monitoring = require('@google-cloud/monitoring');

// Check happens after require
if (!process.env.GCP_CREDENTIALS || process.env.GCP_CREDENTIALS.trim() === '') {
  process.exit(0);
}
const gcpCredentials = JSON.parse(process.env.GCP_CREDENTIALS);

After:

// Check happens before any requires
if (!process.env.GCP_CREDENTIALS || process.env.GCP_CREDENTIALS.trim() === '') {
  console.log('GCP_CREDENTIALS not set. Skipping metrics reporting.');
  process.exit(0);
}

const Monitoring = require('@google-cloud/monitoring');
const gcpCredentials = JSON.parse(process.env.GCP_CREDENTIALS);

Original prompt

Reference: https://github.com/Snapp949/agoric-sdk/actions/runs/22013178321/job/63610640249#step:6:1

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[Snapp949]

Ty