Replace Docker with composite action #140
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These timings are fairly rough, I've included a baseline (using the current Docker action, as well as installing dart and installing):
Downloading the binary is faster than downloading dart and building the binary which in turn is faster than building a docker image. There are various tricks to downloading binaries + extracting them, I have an action to do that, but I'm not trying to offer my actions here, so I've just hand rolled a simple thing that should work.
Windows and macOS are slower. I'm providing them to show that the action will work for those platforms too.