This workflow is too spendthrift for deployment: every job sets up Rust,
and the `build` job also installs Trunk, which takes even more
resources. The workflow serves well, however, as a proof of concept.
Introducing a syntax error into `src/main.rs` causes the `build` and
`test` jobs to fail, but allows `run-examples` to succeed. Similarly,
introducing a syntax error into `examples/point-on-sphere.rs` causes
`run-examples` to fail, but allows the other jobs to succeed.
