🤖 Add macOS runtime integration tests to CI

Add a dedicated CI job to run runtime integration tests on macOS. The main
integration suite already covers Linux runtime tests, but we run runtime tests
on macOS specifically because this code is particularly prone to system
incompatibilities (process spawning, stream handling, file operations).

Running the full integration suite on a matrix would be wasteful - we only
need to verify runtime behavior across platforms.

_Generated with `cmux`_

Author: ammar-agent

.github/workflows/ci.yml

@@ -108,6 +108,38 @@ jobs:
     runs-on: ${{ github.repository_owner == 'coder' && 'depot-ubuntu-22.04-16' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
+
+  # Runtime Integration Tests (macOS)
+  # The main integration suite covers Linux runtime tests already. We only run runtime tests
+  # on macOS because this part of the code is particularly prone to system incompatibilities
+  # (process spawning, stream handling, file operations). Running the full integration suite
+  # on a matrix would be wasteful.
+  integration-tests-runtime-macos:
+    name: Runtime Integration Tests (macOS)
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Load .env
+        run: |
+          if [ -f .env ]; then
+            set -a
+            source .env
+            set +a
+          fi
+
+      - name: Run runtime integration tests
+        run: TEST_INTEGRATION=1 bun x jest tests/runtime/runtime.test.ts
+        env:
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+
         uses: actions/checkout@v4
         with:
           fetch-depth: 0 # Required for git describe to find tags