Build the adapter in CI, and fail on warnings

.github/workflows/test.yml

@@ -43,6 +43,8 @@ jobs:
     - name: test
       run: make ci
       shell: bash
+    - name: adapter
+      run: cargo build --release -p viceroy-component-adapter --target wasm32-unknown-unknown
 
   # Run the trap test in an isolated job. It needs different cargo features than the usual build, so
   # it entails rebuilding the whole workspace if we combine them in a single job. This way, we

crates/adapter/src/lib.rs

@@ -1,3 +1,6 @@
+// Promote warnings into errors, when building in release mode.
+#![cfg_attr(not(debug_assertions), deny(warnings))]
+
 use crate::bindings::wasi::clocks::{monotonic_clock, wall_clock};
 use crate::bindings::wasi::io::poll;
 use crate::bindings::wasi::io::streams;