(maint) Debug output GEM_HOME and GEM_PATH before executing module co…

…mmands

To aid troubleshooting in cases of ruby environment doubts.

lib/pdk/cli/exec.rb

@@ -217,6 +217,10 @@ def run_process_in_clean_env!
         def run_process!
           command_string = argv.join(' ')
           PDK.logger.debug(_("Executing '%{command}'") % { command: command_string })
+          if context == :module
+            PDK.logger.debug(_("Command environment: GEM_HOME is '%{gem_home}' and GEM_PATH is '%{gem_path}'") % { gem_home: @process.environment['GEM_HOME'],
+                                                                                                                   gem_path: @process.environment['GEM_PATH'] })
+          end
           start_time = Time.now
           begin
             @process.start

spec/unit/pdk/cli/exec/command_spec.rb

@@ -89,7 +89,7 @@
         allow(PDK::Util).to receive(:module_root).with(no_args).and_return('/invalid_path')
         allow(Dir).to receive(:chdir).with('/invalid_path').and_yield
         allow(process).to receive(:exit_code).and_return 0
-        allow(process).to receive(:environment).and_return environment
+        allow(process).to receive(:environment).at_least(:once).and_return environment
       end
 
       it { expect { command.execute! }.not_to raise_error }