Use repository root Dockerfile, make Go cross-build robust, and fix process wait logic

[CJackHwang]

Motivation

• Align CI release workflows to the repository root Dockerfile path so Buildx can find the Dockerfile used for multi-arch images.
• Make the Go build in the Dockerfile robust when TARGETOS/TARGETARCH are not provided by falling back to go env values.
• Improve build reliability by failing fast and making the build step verbose.
• Fix incorrect child-process liveness detection in start.mjs so the script can wait for spawned processes reliably.

Description

• Updated .github/workflows/release.yml and .github/workflows/release-dockerhub.yml to use file: ./Dockerfile instead of ./docker/Dockerfile for the docker/build-push-action.
• Modified Dockerfile to remove hard-coded default ARG values and to compute GOOS/GOARCH with GOOS="${TARGETOS:-$(go env GOOS)}" and GOARCH="${TARGETARCH:-$(go env GOARCH)}", and replaced the go build line with a set -eux wrapper to improve error visibility.
• Kept the multi-stage layout and artifacts but made the Go build step deterministic for both provided and absent TARGET* args.
• Fixed waitForProcesses in start.mjs to count active processes using proc.exitCode === null && proc.signalCode === null instead of relying on p.killed.

Testing

• Ran local multi-arch builds using docker buildx build with --platform linux/amd64,linux/arm64 against the updated Dockerfile, and image builds completed successfully.
• Executed a local smoke test of the start script and confirmed the updated waitForProcesses correctly detects running children and resolves when they exit.
• CI release workflows were updated to the new Dockerfile path so subsequent GitHub Actions runs will exercise the updated build steps.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
ds2api	Ready	Preview, Comment	Feb 28, 2026 10:40am

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