[SDK-2337] Upgrade GoReleaser to v2.15 and simplify config with dockers_v2

[aaron-zeisler]

Summary

• Upgrade GoReleaser from v2.11.2 to v2.15.4
• Replace legacy dockers + docker_manifests (51 entries) with dockers_v2 (3 entries)
• Reduce .goreleaser.yml from 529 lines to 117 lines (77% reduction)

Motivation

The current GoReleaser config is 529 lines, with the vast majority being repetitive Docker image/manifest definitions (36 dockers entries + 15 docker_manifests entries). GoReleaser v2.12 introduced dockers_v2, which uses docker buildx natively to build multi-arch manifests in a single step — eliminating the need to separately define per-architecture images and then wire them together in manifests.

This is an alternative to fully replacing GoReleaser (see #660). Instead of removing GoReleaser, this approach upgrades it and leverages new features to achieve the same goal of simplification.

Changes

File	Description
.goreleaser.yml	Rewritten: 529 → 117 lines. Uses dockers_v2 with conditional tag templates
Dockerfile.goreleaser	Use ARG TARGETPLATFORM + COPY ${TARGETPLATFORM}/ld-relay
Dockerfile-static-debian12-nonroot.goreleaser	Same
Dockerfile-static-debian12-debug-nonroot.goreleaser	Same
.github/actions/publish/action.yml	Pin GoReleaser ~> v2.15, update artifact digest query
scripts/run-goreleaser.sh	v2.11.2 → v2.15.4

How dockers_v2 simplifies things

Before (legacy): Each Docker tag × architecture × variant required its own entry, with manual skip_push conditionals. Manifests were separately wired to reference the per-arch images by tag name.

After (dockers_v2): One entry per Dockerfile variant. Tags use Go template conditionals (empty tags are ignored). GoReleaser + buildx handle multi-arch manifest creation automatically.

# Example: the Alpine variant — replaces 12 dockers entries + 6 docker_manifests entries
- id: alpine
  dockerfile: Dockerfile.goreleaser
  images:
    - "launchdarkly/ld-relay"
  tags:
    - "{{ .Version }}"
    - "{{ .Version }}-alpine"
    - '{{ if eq .Env.LD_RELEASER_UPDATE_MAJOR "true" }}v{{ .Major }}{{ end }}'
    - '{{ if eq .Env.LD_RELEASER_UPDATE_MAJOR "true" }}v{{ .Major }}-alpine{{ end }}'
    - '{{ if eq .Env.LD_RELEASER_UPDATE_LATEST "true" }}latest{{ end }}'
    - '{{ if eq .Env.LD_RELEASER_UPDATE_LATEST "true" }}latest-alpine{{ end }}'
  platforms:
    - linux/amd64
    - linux/arm64
    - linux/arm/v7
    - linux/386

Other cleanup

• Removed dead ldflags (-X internal.version.Version={{.Version}} has no effect since Version is a const, not a var)
• Updated artifact digest query to handle both "Docker Manifest" and "Docker Image" artifact types

Test plan

• Verify GoReleaser v2.15 passes goreleaser check on the new config
• Dry-run in CI to confirm binary/package builds still work
• Verify Docker image tags match existing naming conventions
• Confirm attestation output (images_and_digests) is correctly populated
• Test snapshot mode locally: goreleaser release --snapshot --clean

Note

dockers_v2 is currently marked as experimental in GoReleaser and will become the default dockers in v3. The legacy dockers + docker_manifests will be deprecated at that point.

JIRA

SDK-2337

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