chore: add CI

.github/actions/setup/action.yml

@@ -0,0 +1,16 @@
+name: Install Yarn dependencies
+description: Installs the workspace's yarn dependencies and caches them
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/setup-node@v4
+      id: node
+      with:
+        node-version: 18.19.0
+        cache: 'yarn'
+        cache-dependency-path: 'yarn.lock'
+
+    - name: Install
+      run: yarn --immutable
+      shell: bash

.github/workflows/formatting.yml

@@ -0,0 +1,28 @@
+name: Formatting
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+# This will cancel previous runs when a branch or PR is updated
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+   eslint:
+    name: eslint
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Yarn dependencies
+        uses: ./.github/actions/setup
+
+      - name: Run `yarn lint`
+        run: yarn lint

.github/workflows/test.yml

@@ -0,0 +1,28 @@
+name: Tests
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+# This will cancel previous runs when a branch or PR is updated
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: Integration Tests (Node)
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Yarn dependencies
+        uses: ./.github/actions/setup
+
+      - name: Run `yarn test`
+        run: yarn test