Add pipefail to inline commands to run tests in CI

Author: mokagio

.buildkite/pipeline.yml

@@ -102,6 +102,7 @@ steps:
               context: "Reader Unit Tests"
       - label: "🔬 Keystone Unit Tests"
         command: |
+          set -o pipefail
           .buildkite/commands/shared-set-up.sh
           xcodebuild \
             -scheme Keystone \
@@ -116,6 +117,7 @@ steps:
               context: "Unit Tests Keystone"
       - label: "🔬 WordPressData Unit Tests"
         command: |
+          set -o pipefail
           .buildkite/commands/shared-set-up.sh
           xcodebuild \
             -scheme WordPressData \