add GHA workflow (#1)

* add GHA workflow

Signed-off-by: Jason Hall <jason@chainguard.dev>

* fix CI

Signed-off-by: Jason Hall <jason@chainguard.dev>

* update readme

Signed-off-by: Jason Hall <jason@chainguard.dev>

* add badge

Signed-off-by: Jason Hall <jason@chainguard.dev>

---------

Signed-off-by: Jason Hall <jason@chainguard.dev>

.github/workflows/ci.yml

@@ -0,0 +1,61 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        rust: [stable]
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        toolchain: ${{ matrix.rust }}
+        components: clippy, rustfmt
+
+    - name: Cache cargo registry
+      uses: actions/cache@v3
+      with:
+        path: ~/.cargo/registry
+        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Cache cargo index
+      uses: actions/cache@v3
+      with:
+        path: ~/.cargo/git
+        key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Cache cargo build
+      uses: actions/cache@v3
+      with:
+        path: target
+        key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Run tests
+      run: cargo test --verbose
+
+    - name: Run clippy
+      run: cargo clippy --all-targets -- -D warnings
+
+    - name: Check formatting
+      run: cargo fmt -- --check
+
+    - name: Test sample-cli example
+      run: |
+        cd examples/sample-cli
+        cargo test --verbose