ci: Fix not failing when SPM tests fail

Author: cbaker6

.github/workflows/ci.yml

@@ -76,7 +76,7 @@ jobs:
     - name: Use multiple cores
       run: defaults write com.apple.dt.XCBuild EnableSwiftBuildSystemIntegration 1
     - name: Build-Test
-      run: swift test --enable-code-coverage | xcpretty -c
+      run: set -o pipefail && env NSUnbufferedIO=YES swift test --enable-code-coverage | xcpretty -c
       env:
           DEVELOPER_DIR: ${{ env.CI_XCODE_LATEST }}
     - name: Prepare codecov