Only sign for Windows in official Arduino repo #4607

Job	Run time
run-determination	1s
build-type-determination	1s
select-targets	3s
build (Windows)	20m 53s
build (Linux)	8m 35s
build (macOS x86)	1h 17m 12s
build (macOS ARM)	11m 24s
changelog	9s
merge-channel-files	0s
Windows_X86-64_interactive_installer artifact	51s
Windows_X86-64_MSI artifact	54s
Windows_X86-64_zip artifact	56s
Linux_X86-64_zip artifact	56s
Linux_X86-64_app_image artifact	57s
macOS_X86-64_dmg artifact	59s
macOS_X86-64_zip artifact	52s
macOS_arm64_dmg artifact	59s
macOS_arm64_zip artifact	52s
release	0s
publish	0s
clean	3s
	2h 6m 37s

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