Add touch method to Builder class and update handling of empty files

- Add a touch method to the Builder class for writing empty files to the installation package.
- Rename the existing empty file to a more explicit name and move it to the Builder class's definition folder.
- This change abstracts the touch-equivalent operation, replacing the previous method of writing empty files using the copy_file method.

bin/ocran

@@ -753,7 +753,7 @@ EOF
       # Workaround: RubyInstaller cannot find the msys folder if ../msys64/usr/bin/msys-2.0.dll is not present (since RubyInstaller-2.4.1 rubyinstaller 2 issue 23)
       # Add an empty file to /msys64/usr/bin/msys-2.0.dll if the dll was not required otherwise
       unless builder.files.values.any? { |entry, _src| entry.to_s.include?("msys-2.0.dll") }
-        builder.copy(Pathname(File.dirname(__FILE__)) / "../share/ocran/empty-msys-2.0.dll", 'msys64/usr/bin/msys-2.0.dll')
+        builder.touch('msys64/usr/bin/msys-2.0.dll')
       end
 
       # Set environment variable

lib/ocran/inno_setup_builder.rb

@@ -197,6 +197,11 @@ def copy_file(src, tgt, dest_name: nil)
     alias copy copy_file
     alias cp copy_file
 
+    def touch(tgt)
+      src = Pathname.new(File.expand_path("touch_placeholder", __dir__))
+      copy_file(src, tgt)
+    end
+
     # Specifies the final application script to be launched, which can be called
     # from any position in the data stream. It cannot be specified more than once.
     def set_script(image, script, *argv)

lib/ocran/stub_builder.rb

@@ -129,6 +129,11 @@ def copy_file(src, tgt)
     alias copy copy_file
     alias cp copy_file
 
+    def touch(tgt)
+      src = Pathname.new(File.expand_path("touch_placeholder", __dir__))
+      copy_file(src, tgt)
+    end
+
     # Specifies the final application script to be launched, which can be called
     # from any position in the data stream. It cannot be specified more than once.
     #