Update Asset directory functionality to recursively search the directory and call apk.addFileInput for each file #219

Job	Run time
zig fmt --check	12s
setup environment variables as outputs	2s
Build Zig Previous (macos-14)	2m 5s
Build Zig Stable (macos-14)	1m 57s
Build Zig Previous (windows-latest)	2m 27s
Build Zig Nightly (windows-latest)	4m 26s
Build Zig Stable (ubuntu-latest)	1m 51s
Build Zig Stable (windows-latest)	3m 1s
Build Zig Previous (ubuntu-latest)	1m 18s
Build Zig Nightly (macos-14)	1m 31s
Build Zig Nightly (ubuntu-latest)	1m 27s
	20m 17s

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