feat: cache downloaded binaries

Closes #4

Author: EricCrosson

README.md

@@ -19,6 +19,7 @@ This action only supports installing from releases where the release:
 - is tagged with the full `{major}.{minor}.{patch}` semantic version
 - contains raw binary assets (archives not supported)
 - assets are labeled ending with the binary's [target triple]
+- the binary name is the repository name
 
 You can create compatible releases with [semantic-release], using a workflow like this [semantic-release Rust action].