Provide diag code for push timeout

Description

Oct 09 21:46:40 skaffold-vm-2 metrics-collector.sh[5929]: 2021/10/09 21:46:40 received event: timestamp:<seconds:1633816000 nanos:769760789 > event:<buildEvent:<artifact:"gcr.io/bank-of-anthos/frontend" status:"In Progress" > > entry:"Build started for artifact gcr.io/bank-of-anthos/frontend"
Oct 09 21:46:55 skaffold-vm-2 metrics-collector.sh[5929]: 2021/10/09 21:46:55 received event: timestamp:<seconds:1633816015 nanos:690920367 > event:<buildEvent:<artifact:"gcr.io/bank-of-anthos/frontend" status:"Failed" err:"could not push image \"gcr.io/aprindle-billing-test/gcr.io/bank-of-anthos/frontend:latest\": received unexpected HTTP status: 504 Gateway Timeout" errCode:BUILD_
Oct 09 21:46:55 skaffold-vm-2 metrics-collector.sh[5929]: 2021/10/09 21:46:55 received event: timestamp:<seconds:1633816015 nanos:691603228 > event:<devLoopEvent:<iteration:1 status:"Failed" err:<errCode:BUILD_UNKNOWN message:"could not push image \"gcr.io/aprindle-billing-test/gcr.io/bank-of-anthos/frontend:latest\": received unexpected HTTP status: 504 Gateway Timeout" > > > entry

Contributor guide

Tech stack

godockerkubernetes

Domain

clibuild systemdeveloper experience

Issue type

feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

clear

Prerequisites

Basic Go knowledgeFamiliarity with Skaffold build system

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

65

Research direction

First, locate where diagnostic codes are defined in the Skaffold codebase (likely in a constants or errors package, e.g., pkg/skaffold/constants or similar). Then find the code that handles build push errors and maps them to current error codes. Add a new diagnostic code for push timeout (e.g., BUILD PUSH TIMEOUT) and update the error mapping to use it when a 504 Gateway Timeout occurs during push. Verify that the new code is properly exported and integrated into the metrics/event system. No linked PRs or comments exist; this is a fresh feature request.