publisher: move release artifacts to the same directory #30

Job	Run time
Provide additional context for the workflow	7s
Build release binaries (Linux)	6m 36s
Build release binaries (macOS)	7m 52s
Build source archive	2m 21s
Build docs and release artifacts (Linux)	6m 46s
Build and test tooling (Linux)	2m 35s
Test the compiler and stdlib (Linux, batch #0)	5m 20s
Build docs and release artifacts (macOS)	9m 48s
Build and test tooling (macOS)	4m 14s
Test the compiler and stdlib (Linux, batch #1)	4m 56s
Test the compiler and stdlib (macOS, batch #0)	9m 9s
Test the compiler and stdlib (macOS, batch #1)	8m 27s
Build release artifacts from source archive (Linux)	9m 16s
Build release artifacts from source archive (macOS)	13m 4s
Test release artifacts	24s
All check passed	1s
	1h 30m 56s

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