chore: Add a source tarball deploy workflow. #273

Job	Run time
Prepare / Update nightly release tag	2s
iOS (ios-arm64)	23s
iOS (ios-armv7)	23s
iOS (ios-armv7s)	22s
iOS (iphonesimulator-arm64)	23s
Android (armeabi-v7a)	23s
Linux (aarch64)	1m 3s
macOS (arm64)	21s
iOS (iphonesimulator-x86_64)	22s
Android (arm64-v8a)	18s
Linux (x86_64)	1m 8s
macOS (x86_64)	38s
Android (x86)	28s
Android (x86_64)	27s
WebAssembly	1m 46s
Single file / Build	11s
Source tarball / Build	23s
Xcode Framework	3m 16s
	12m 17s

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