CI: Add cache action to preserve build artifacts. #417
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Right now CI rebuilds from scratch for each step. It takes way longer than it needs to. This action supposedly will cache the build artifacts so they can be re-used each step.
Note
Github Copilot made this... so who knows if it actually works.
To Do
cargo build --all-featuresor something first, then run everything else afterwards? What's the most optimal way?