Set DerivedData explicitly

See how this failed
https://buildkite.com/automattic/simplenote-ios/builds/1326/steps/canvas?sid=0199f262-e52f-47db-a8e3-4d111c4982da

Author: mokagio

.buildkite/commands/build-and-test.sh

@@ -69,11 +69,13 @@ brew install xclogparser
 echo "~~~ Generate HTML report"
 xclogparser parse \
   --project Simplenote \
+  ----derived_data ./DerivedData \
   --reporter html \
   --rootOutput build/reports
 echo "~~~ Generate HTML report"
 xclogparser parse \
   --project Simplenote \
+  ----derived_data ./DerivedData \
   --reporter json > build/reports/report.json
 
 echo "~~~ Annotate build"