Fix goreleaser version ldflags to use .Version instead of .Summary

[Copilot]

The goreleaser configuration was using {{ .Summary }} (commit message) instead of {{ .Version }} (release version) in ldflags, causing the CLI to report commit messages as version strings.

Changes

• .goreleaser.yml: Changed ldflags from {{ .Summary }} to {{ .Version }}

  # Before
  - -X "github.com/mudler/luet/cmd.Version={{ .Summary }}"
  
  # After
  - -X "github.com/mudler/luet/cmd.Version={{ .Version }}"

• .gitignore: Added luet-test* pattern to exclude test binaries

The Makefile ldflags were already correct and unchanged.

Original prompt

Seems the CLI version does not get correctly propagated, the ldflags we set aren't correct

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