Add spinner and background worker for checking for updates #44

Job	Run time
package-macos (arm64-macos, aarch64-macos, macos-latest)	7m 7s
package (x86-64-linux, x86_64-linux-gnu, ubuntu-latest)	7m 14s
package (arm64-linux, aarch64-linux-gnu, ubuntu-latest)	8m 39s
package-macos (x86-64-macos, x86_64-macos, macos-latest)	8m 26s
package (arm64-windows, aarch64-windows-msvc, ubuntu-latest)	9m 54s
package (x86-64-windows, x86_64-windows-msvc, ubuntu-latest)	9m 51s
assemble	17s
	51m 28s

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