Add GitHub Actions configuration

Author: djc

.github/workflows/rust.yml

@@ -0,0 +1,58 @@
+name: CI
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+  schedule:
+    - cron: "25 6 * * 5"
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        rust: [stable, beta]
+        exclude:
+          - os: macos-latest
+            rust: beta
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --all-features --all-targets
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+      - uses: actions-rs/cargo@v1
+        if: always()
+        with:
+          command: clippy
+          args: --workspace --all-targets --all-features -- -D warnings
+
+  audit:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: EmbarkStudios/cargo-deny-action@v1