imageflow_ex
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Add decoding and encoding to string for Graph
I wanted to add on-fly conversion, without saving files anywhere on disk, but send the stream directly to GCloud. As I know it is possible using the low-level API, but it was missing from high-level API. This PR shouldn't affect current I/O, it just adds new features.
I've added required fixes and added an integration test. I've also changed the workflow action, because actions/setup-elixir@v1 is no longer maintained.