ci: add action workflow for ensuring minimum sdk version support (#3462) #4

Job	Run time
Build Amplify Swift for macOS / Build Amplify-Package \| macOS	7m 20s
Build Amplify Swift for tvOS / Build Amplify-Package \| tvOS	2m 48s
Build Amplify Swift for iOS / Build Amplify-Package \| iOS	8m 13s
Build Amplify Swift for watchOS / Build Amplify-Package \| watchOS	2m 59s
Confirm Passing Build Steps	1s
	21m 21s

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