Are there any errors in the Build Logs? Also try Redeploy Latest Commit from the Command Palette (Ctrl/Cmd+K) as the Diagnose said

There are no errors in build logs. Also, I tried redeploying latest commit as suggested. Still the same.

This must be related to the railway build daemon.

“buildkitd.sock: use of closed network connection”

I'm seeing other reports with the same error you're encountering. I'll escalate this to the team

This is on our side. There is an active incident on our build infrastructure (https://status.railway.com/incident/ILLVW9WG, "Builds failing in US West"): builds are failing before any of your build steps run, with the build daemon connection dropping or the build machine never coming up, which is exactly what your deployments show. Your source, build configuration and dependencies are not at fault, and nothing needs to change on your end.

Running services are not affected. A fresh deployment of the same commit may get through in the meantime; otherwise please follow the status page for the all-clear, and redeploy once it is posted.