Add CI.

RIP travis

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+---
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+    pull_request:
+
+env:
+  RUSTFLAGS: -Dwarnings
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust Toolchain
+        run: rustup toolchain install stable --profile minimal --component clippy --component rustfmt --no-self-update
+
+      - uses: swatinem/rust-cache@v2
+
+      - name: Run Rustfmt
+        run: cargo fmt --all -- --check
+
+      - name: Run Clippy
+        run: cargo clippy --workspace --all-features --tests -- -D clippy::all
+
+  test:
+    name: Test (ubuntu)
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-rs/toolchain@16499b5e05bf2e26879000db0c1d13f7e13fa3af # pin@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          override: true
+
+      - uses: swatinem/rust-cache@81d053bdb0871dcd3f10763c8cc60d0adc41762b # pin@v1
+        with:
+          key: ${{ github.job }}
+
+      - name: Run Cargo Tests
+        uses: actions-rs/cargo@844f36862e911db73fe0815f00a4a2602c279505 # pin@v1
+        with:
+          command: test
+          args: --all