Add visionOS CI check to ensure compilation

Adds a minimal CI check for visionOS to verify the code at least compiles
for the platform. Uses cargo check with -Zbuild-std since visionOS is a
tier 3 target without pre-built std. This will catch any libc definition
issues across Apple platforms as suggested by maintainers.

Author: sinkingsugar

.github/workflows/main.yml

@@ -115,6 +115,20 @@ jobs:
     - name: Run check
       run: cargo check --all-features --target wasm32-unknown-unknown
 
+  check-visionos:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: Install toolchain
+      uses: dtolnay/rust-toolchain@nightly
+      with:
+        components: rust-src
+
+    - name: Run check
+      run: cargo check --all-features --target aarch64-apple-visionos -Zbuild-std
+
   test-msrv:
     runs-on: ubuntu-latest
     steps: