Add PR artifact uploads and comments #18

Job	Run time
Test Processing	2m 51s
(linux/aarch64) Create Processing Build	3m 18s
(windows/x64) Create Processing Build	5m 24s
(macos/aarch64) Create Processing Build	5m 29s
(linux/x64) Create Processing Build	4m 21s
(macos/x64) Create Processing Build	4m 56s
	26m 19s

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