ci: adds continuous integration workflow

.github/workflows/CI.yml

@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  format:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: Update Rust
+        run: rustup update nightly && rustup default nightly
+      - name: Install rustfmt
+        run: rustup component add rustfmt
+      - run: cargo fmt -- --check
+
+  lint:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: Update Rust
+        run: rustup update stable && rustup default stable
+      - name: Install clippy
+        run: rustup component add clippy
+      - run: cargo clippy --all-features -- --deny warnings
+
+  test:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: Update Rust
+        run: rustup update stable && rustup default stable
+      - run: cargo test --all-features
+
+  test-examples:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: Update Rust
+        run: rustup update stable && rustup default stable
+      - run: cargo test --all-features --examples
+
+  docs:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: Update Rust
+        run: rustup update stable && rustup default stable
+      - run: cargo doc

src/lib.rs

@@ -21,6 +21,8 @@ pub type BoxedError = Box<dyn std::error::Error>;
 /// A simple example:
 ///
 /// ```rust
+/// use crankshaft::as_into_unwrap();
+///
 /// /// Services that can be registered within the engine.
 /// #[derive(Debug)]
 /// pub enum Service {