Add GitHub Actions CI: fmt, clippy, tests

Author: hitesh-bhatnagar

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: Rust CI
+
+on: 
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs: 
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain-action@v1
+        with:
+          toolchain: stable
+      - name: Install components
+        run: rustup component add clippy rustfmt || true
+      - name: Check formatting
+        run: cargo fmt -- --check
+      - name: Run clippy
+        run: cargo clippy -- -D warnings
+      - name: Run tests
+        run: cargo test --all