add rust build github action

.github/workflows/rust.yml

@@ -0,0 +1,20 @@
+name: Rust
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build winbar
+      run: cd winbar && cargo build --verbose
+    - name: Build winbarc
+      run: cd winbarc && cargo build --verbose