Add PR artifact uploads and comments #20

Job	Run time
Test Processing	2m 55s
(windows/x64) Create Processing Build	6m 18s
(macos/aarch64) Create Processing Build	3m 55s
(linux/aarch64) Create Processing Build	3m 50s
(linux/x64) Create Processing Build	4m 13s
(macos/x64) Create Processing Build	4m 15s
	25m 26s

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