simplify grpc subscription option checks and add github ci workflow

Made-with: Cursor

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: ci
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  rust:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+      - name: fmt
+        run: cargo fmt --all -- --check
+      - name: clippy
+        run: cargo clippy --all-targets --all-features
+      - name: test
+        run: cargo test --all-features