add rust validate

.github/workflows/validate.yaml

@@ -37,3 +37,16 @@ jobs:
       run: CC=clang CXX=clang++ bazel build --check_visibility=false //connections:core --spawn_strategy=standalone
     - name: Build Presence
       run: CC=clang CXX=clang++ bazel build --check_visibility=false //presence --spawn_strategy=standalone --//presence/implementation:enable_rust_ldt=False
+
+    build-rust:
+      name: Build Rust on Linux
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: recursive
+    - name: Build FPP
+      run:  cargo build --manifest-path presence/fpp/fpp/Cargo.toml
+    - name: Build Fairpair
+      run:  cargo build --manifest-path fastpair/rust/Cargo.toml
+