increasing cache time on delivery

When this plugin uploads the media files, it ends up using the default 60 minute cache time. There is no simple way to update this with GCS without iterating through every file using a program, and there’s no way to set an alternative default time on the bucket itself.

There should be a setting here to specify the cache time for each uploaded object. Barring that, there should be a way to specify the publicly visible URL used to access these objects, so we can insert a CDN in front of the bucket which does let us control the caching.

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