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feat: expose OpenCode in desktop installation menus #1

Job	Run time
verify (windows-latest, baseline)	23s
verify (macos-latest, latest)	47s
verify (windows-latest, latest)	26s
verify (ubuntu-latest, baseline)	3m 48s
verify (macos-latest, baseline)	44s
verify (ubuntu-latest, latest)	3m 47s
	9m 55s