print working directory in test output

Author: ianfixes

CHANGELOG.md

@@ -16,6 +16,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added a CI workflow to check for spelling errors
 - Extraction of byes usage in a compiled sketch is now calculated in a method: `ArduinoBackend.last_bytes_usage`
 - Added ```nano_every``` platform to represent ```arduino:megaavr``` architecture
+- Working directory is now printed in test runner output
+
 ### Changed
 - We now compile a shared library to be used for each test.
 - Put build artifacts in a separate directory to reduce clutter.

exe/arduino_ci.rb

@@ -533,6 +533,7 @@ def perform_example_compilation_tests(cpp_library, config)
 
 banner
 inform("Host OS") { ArduinoCI::Host.os }
+inform("Working directory") { Dir.pwd }
 
 # initialize command and config
 config = ArduinoCI::CIConfig.default.from_project_library