Ensure that we run the doctests

Due to a limitation in how doctests are exposed in stable Rust, nextest
does not actually run them by default. We unfortunately need an explicit
step for the time being.

See:
- nextest-rs/nextest#16

.github/cue/rust.cue

@@ -94,6 +94,10 @@ rust: _#borsWorkflow & {
  name: "Run tests"
  run: "cargo nextest run --locked"
  },
+ {
+ name: "Run doctests"
+ run: "cargo test --locked --doc"
+ },
  ]
  }
 

.github/workflows/rust.yml

@@ -146,6 +146,8 @@ jobs:
  run: cargo test --locked --no-run
  - name: Run tests
  run: cargo nextest run --locked
+ - name: Run doctests
+ run: cargo test --locked --doc
  checkMsrv:
  name: check / msrv
  needs: