Add CI.

.github/workflows/ci.yml

@@ -0,0 +1,109 @@
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+env:
+  RUST_VERSION: 1.80.0
+  CARGO_TERM_COLOR: always
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ env.RUST_VERSION }}
+          override: true
+          components: clippy
+
+      - name: Run cargo check
+        uses: actions-rs/cargo@v1
+        with:
+          command: check
+
+      - name: Run cargo clippy
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --workspace --all-targets --all-features -- -D warnings
+
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ env.RUST_VERSION }}
+          override: true
+
+      - name: Run cargo test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          # --all-targets includes --benches, which we don't want.
+          args: --workspace --all-features --lib --bins --tests --examples --verbose
+
+  rustfmt:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Install nightly toolchain with rustfmt available
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+          components: rustfmt
+
+      - name: Run cargo fmt
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check --verbose
+
+  doc:
+    name: Doc
+    runs-on: ubuntu-latest
+    env:
+      RUSTDOCFLAGS: -D warnings
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ env.RUST_VERSION }}
+          override: true
+
+      - name: Run cargo doc
+        uses: actions-rs/cargo@v1
+        with:
+          command: doc
+          args: --no-deps --verbose
+
+      - name: Run cargo test --doc
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --workspace --all-features --doc --verbose
+