Add graphicsmagick for alpine

[Taka-Kazu]

3.23: https://pkgs.alpinelinux.org/package/v3.23/community/x86_64/graphicsmagick
3.20: https://pkgs.alpinelinux.org/package/v3.20/community/x86_64/graphicsmagick

[github-actions]

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For changes related to rosdep:

• ✅ Platforms for new rosdep rules are valid

For changes related to yamllint:

• ✅ All new lines of YAML pass linter checks

[f-fl0]

LGTM