Try to fix CI failure

Author: alexcrichton

.github/workflows/main.yml

@@ -130,10 +130,10 @@ jobs:
           --artifacts target/artifacts \
           --rust-wit-bindgen-path ./crates/guest-rust
 
-    # Run all runtime tests for this language, and also enable Rust in case this
-    # language only implements either the runner or test component
+    # Run all runtime tests for this language, and also enable Rust & C in case
+    # this language only implements either the runner or test component
     - run: |
-        cargo run test --languages rust,${{ matrix.lang }} tests/runtime \
+        cargo run test --languages rust,c,${{ matrix.lang }} tests/runtime \
           --artifacts target/artifacts \
           --rust-wit-bindgen-path ./crates/guest-rust