Add a package for working with a cache. #2
Merged
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This adds a relatively simple
CacheDirectory
struct, which represents a directory in which the contents of the CodeQL Action repository and releases can be stored. This allows for the Action to be updated incrementally rather than re-downloaded in full each time the tool is run.The cache directory is versioned along with the sync tool. If you are pulling the Action and the cache version does not match the version of the sync tool the cache will be deleted and replaced. If you are pushing the Action and the cache version does not match an error will be returned. This allows us to change the format of the cache in future versions if required.
There are also a few functions for navigating the cache, for example for finding the directory in which the Git contents is stored and navigating releases of the CodeQL bundle.