Add simple CI setup

.changeset/proud-pets-check.md

@@ -0,0 +1,5 @@
+---
+"bits-to-dead-trees": patch
+---
+
+Add CI setup

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on: push
+
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v3
+
+      - name: Set up Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: lts/*
+          cache: npm
+
+      - name: Run eslint
+        run: npm run lint
+
+      - name: Run prettier
+        run: npm run check-format

package.json

@@ -15,6 +15,7 @@
   },
   "main": "dist/index.js",
   "scripts": {
+    "check-format": "prettier --check 'src/**/*.ts'",
     "clean": "rimraf dist",
     "lint": "eslint src/*.ts",
     "format": "prettier --write src/**/*.{ts,json}",