wasmtime: Add FreeBSD x86 check CI Job

We accidentally broke the build for FreeBSD when introducing the jit-icache-coherence
crate. To avoid this happening again, add a check job just to ensure that it can build.

See bytecodealliance#5323 and bytecodealliance#5331 for context.

.github/workflows/main.yml

@@ -186,6 +186,19 @@ jobs:
     - run: rustup target add aarch64-pc-windows-msvc
     - run: cargo check -p wasmtime --target aarch64-pc-windows-msvc
 
+  # Check whether `wasmtime` cross-compiles to x86_64-unknown-freebsd
+  # Tracking issue: https://github.com/bytecodealliance/wasmtime/issues/2269
+  checks_freebsd_x86:
+    name: Check FreeBSD x86_64
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: true
+    - uses: ./.github/actions/install-rust
+    - run: rustup target add x86_64-unknown-freebsd
+    - run: cargo check --all --target x86_64-unknown-freebsd
+
   fuzz_targets:
     name: Fuzz Targets
     runs-on: ubuntu-latest