.github: add CI action

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+on: [push, pull_request, workflow_dispatch]
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dtolnay/rust-toolchain@1.77.0
+      id: toolchain
+      with:
+        components: clippy, rustfmt
+    - uses: actions/cache@v4
+      with:
+        path: target
+        key: ${{runner.os}}-target-${{steps.toolchain.outputs.cachekey}}-${{hashFiles('Cargo.lock')}}
+    - run: cargo build --tests
+    - run: cargo test
+    - run: cargo clippy --tests --no-deps -- -D warnings
+    - run: cargo fmt --check

README.md

@@ -1,5 +1,7 @@
 # Goldenscript
 
+[![CI](https://github.com/erikgrinaker/toydb/actions/workflows/ci.yml/badge.svg)](https://github.com/erikgrinaker/toydb/actions/workflows/ci.yml)
+
 A Rust testing framework loosely based on Cockroach Labs'
 [`datadriven`](https://github.com/cockroachdb/datadriven) framework for Go. It
 combines several testing techniques that make it easy and efficient to write and