ci: split CI into separate Build, Typecheck, and Test jobs

Author: nigel-dev

.github/workflows/ci.yml

@@ -2,34 +2,53 @@ name: CI
 
 on:
   pull_request:
+    branches: [main]
   push:
-    branches:
-      - main
+    branches: [main]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  BUN_VERSION: '1.2'
 
 jobs:
-  build-and-test:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: ${{ env.BUN_VERSION }}
+
+      - run: bun install --frozen-lockfile
+      - run: bun run build
+
+  typecheck:
+    name: Typecheck
     runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: ${{ env.BUN_VERSION }}
 
+      - run: bun install --frozen-lockfile
+      - run: bun run typecheck
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v6
+      - uses: actions/checkout@v6
 
-      - name: Setup Bun
-        uses: oven-sh/setup-bun@v2
+      - uses: oven-sh/setup-bun@v2
         with:
-          bun-version: 1.3.9
-
-      - name: Install dependencies
-        run: bun install --frozen-lockfile
-
-      - name: Build
-        run: bun run build
-
-      - name: Test
-        shell: bash
-        run: |
-          set -euo pipefail
-          shopt -s globstar nullglob
-          for file in tests/**/*.test.ts; do
-            bun test "$file"
-          done
+          bun-version: ${{ env.BUN_VERSION }}
+
+      - run: bun install --frozen-lockfile
+      - run: bun test