legacy: refacored `makeSourceFile` / other minor code moved #3153

Job	Run time
run-determination	1s
package-name-prefix	1s
Create artifact Windows_X86-32	1m 37s
Create artifact Windows_X86-64	2m 8s
Create artifact Linux_X86-32	1m 41s
Create artifact Linux_X86-64	1m 36s
Create artifact Linux_ARMv6	1m 24s
Create artifact Linux_ARMv7	1m 22s
Create artifact Linux_ARM64	1m 25s
Create artifact macOS_64	2m 12s
Create artifact macOS_ARM64	2m 39s
Create artifact rpc-protocol-files	13s
Create artifact configuration-schema	13s
checksums	10s
	16m 42s

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