Add PR artifact uploads and comments #19

Job	Run time
Test Processing	3m 7s
(linux/aarch64) Create Processing Build	3m 26s
(windows/x64) Create Processing Build	5m 5s
(macos/aarch64) Create Processing Build	4m 44s
(linux/x64) Create Processing Build	4m 23s
(macos/x64) Create Processing Build	4m 0s
	24m 45s

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