Write the signing command over multiple lines. #917

Job	Run time
MacOS (Q8/Q16/Q16-HDRI)	3m 41s
Linux (Q8/Q16/Q16-HDRI, x64)	4m 9s
Linux musl (Q8/Q16/Q16-HDRI, x64)	3m 59s
Library (Core)	7m 38s
Library (SystemDrawing)	6m 20s
MacOS (Q8/Q16/Q16-HDRI, arm64)	2m 47s
Library (SystemWindowsMedia)	8m 17s
Windows (Q8, x86)	10m 36s
Windows (Q8, x64)	8m 41s
Windows (Q8, arm64)	7m 46s
Windows (Q8, Any CPU)	8m 5s
Windows (Q8-OpenMP, x64)	7m 39s
Windows (Q8-OpenMP, arm64)	6m 56s
Windows (Q16, x86)	11m 14s
Windows (Q16, x64)	9m 30s
Windows (Q16, arm64)	7m 50s
Windows (Q16, Any CPU)	9m 33s
Windows (Q16-OpenMP, x64)	7m 57s
Windows (Q16-OpenMP, arm64)	7m 13s
Windows (Q16-HDRI, x86)	10m 2s
Windows (Q16-HDRI, x64)	8m 41s
Windows (Q16-HDRI, arm64)	11m 2s
Windows (Q16-HDRI, Any CPU)	9m 20s
Windows (Q16-HDRI-OpenMP, x64)	8m 50s
Windows (Q16-HDRI-OpenMP, arm64)	7m 39s
	3h 15m 25s

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