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Fix Docker Compose Environment Variable Missing Errors - Fix npm run build Failed with PostCSS Error-Fixing Cloudflare 521 Error: Origin Unreachable

Updated 2026-07-28 17:57:28browser-issues
Fix Docker Compose Environment Variable Missing Errors - Fix npm run build Failed with PostCSS Error-Fixing Cloudflare 521 Error: Origin Unreachable
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.

More repair notes

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