Make GitHub Actions simpler and faster

.github/workflows/ci.yaml

@@ -0,0 +1,49 @@
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+defaults:
+  run:
+    shell: bash
+
+env:
+  RUSTFLAGS: --deny warnings
+
+name: CI
+
+jobs:
+  test:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Install Rust Toolchain Components
+      uses: actions-rs/toolchain@v1
+      with:
+        components: clippy, rustfmt
+        override: true
+        toolchain: stable
+
+    - uses: Swatinem/rust-cache@v2
+
+    - name: Clippy
+      run: cargo clippy --all --all-targets
+
+    - name: Format
+      run: cargo fmt --all -- --check
+
+    - name: Test
+      run: cargo test --all
+
+  integration:
+    name: Integration Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: ./contrib/integration_test.sh 0.21.0