build: add release and release dry run pipeline

[idebeijer]

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[Copilot]

Pull Request Overview

Adds release automation and dry-run pipelines using GoReleaser and GitHub Actions, plus basic version metadata injection.

• Introduces version metadata package and GoReleaser configuration for multi-arch builds and image publishing.
• Adds release workflow (tag-driven) and a snapshot workflow (manual) and a chart test workflow.
• Minor Makefile target to run local snapshot builds.

Reviewed Changes

Copilot reviewed 8 out of 30 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
pkg/version/version.go	New version metadata package exposing Version, Commit, Date, BuiltBy and helper methods.
PROJECT	Enables the Helm Kubebuilder plugin to support chart scaffolding.
Makefile	Adds goreleaser snapshot target for local dry runs.
Dockerfile.goreleaser	Minimal distroless runtime image consuming prebuilt manager binary.
.goreleaser.yaml	GoReleaser config for building binaries and container images, tagging, and changelog.
.github/workflows/test-chart.yml	E2E-style workflow to lint/install the chart into a kind cluster.
.github/workflows/release.yml	Tag-triggered release pipeline running GoReleaser and publishing the Helm chart to GHCR.
.github/workflows/goreleaser-snapshot.yml	Manually triggered GoReleaser snapshot workflow.

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