Adding snap classic confinement support #243

Job	Run time
Test Processing	4m 16s
(linux/aarch64) Create Processing Build	7m 34s
(macos/x64) Create Processing Build	9m 55s
(windows/x64) Create Processing Build	10m 30s
(linux/x64) Create Processing Build	9m 41s
(macos/aarch64) Create Processing Build	5m 26s
	47m 22s

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