Support for caching multiple directories

[smsunarto]

Currently, the plugin only takes in a single directory/path for caching. It would be great to have support for caching multiple directories so you don't have to create multiple entries of cache.

[toote]

@smsunarto this is an interesting idea but I can't think of a good reason to do this that wouldn't overcomplicate the code of the plugin without a lot of clarifications in the documentation. In particular, when specifying multiple paths my brain automatically assumes that they are to be treated as a unit so they should all be part of the the same cache entry. Unfortunately, that would mean that the cache entry would only work if the same paths are specified and in the same order (and/or further code will be necessary to make the entry calculation stable) which would be counter-intuitive.

On the other hand, if we are talking about each path having its own cache entry, the code changes to the plugin itself is not too complicated. But then you would be assuming that they share the same configuration for every other setting, or we would need to complicate the settings for the plugin A LOT to handle all possible cases for very little gain when using multiple plugin entries in the step makes a lot more sense and is already flexible enough.

Or is there anything I am missing here?

[smsunarto]

On the other hand, if we are talking about each path having its own cache entry, the code changes to the plugin itself is not too complicated. But then you would be assuming that they share the same configuration for every other setting,

I think this is perfectly fine for starters; I'd imagine this covers the bases for a lot of people who would need to cache multiple directories.

For example: one of our use case is for Go linting and we want to cache both the Go linter artifacts (to make subsequent runs faster) and the golangci-lint binary, which is in separate paths.

I'd imagine people who needs to have different cache configurations would be fine with creating a separate cache entry.