Adding snap classic confinement support #242

Job	Run time
Test Processing	4m 37s
(linux/x64) Create Processing Build	2m 5s
(macos/x64) Create Processing Build	3m 2s
(macos/aarch64) Create Processing Build	1m 21s
(windows/x64) Create Processing Build	1m 31s
(linux/aarch64) Create Processing Build	1m 41s
	14m 17s

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