Add file::with_tmpfile() function

!feature

* **Add `file::with_tmpfile()` function**
  Create a temporary file and execute the block with the filename created as an
  argument. The file is deleted after the block execution. This will only
  operate on the machine you run Bolt on.

bolt-modules/file/lib/puppet/functions/file/with_tmpfile.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+require 'tempfile'
+
+# Create a temporary file and execute the block with the filename created as an
+# argument. The file is deleted after the block execution. This will only
+# operate on the machine you run Bolt on.
+Puppet::Functions.create_function(:'file::with_tmpfile') do
+  # @param basename Determines the name of the temporary file (see ruby's Tempfile.new)
+  # @param tmpdir Directory to place the temporary file in (ruby's Dir.tmpdir is default value)
+  # @param block The block to execute with a temporary filename
+  # @example Run a command with a temporary file
+  #   # NOTE: This will work on the Bolt controller node only!
+  #   $res = file::with_tmpfile('foo') |$filename| {
+  #     run_command("do_something_with '${filename}'", 'localhost')
+  #     upload_file($filename, $targets)
+  #   }
+  dispatch :with_tmpfile do
+    param 'String', :basename
+    optional_param 'Optional[String[1]]', :tmpdir
+    block_param 'Callable[1, 1]', :block
+    return_type 'Any'
+  end
+
+  def with_tmpfile(basename = '', tmpdir = nil)
+    # Send Analytics Report
+    Puppet.lookup(:bolt_executor) {}&.report_function_call(self.class.name)
+
+    f = Tempfile.new(basename, tmpdir)
+    f.close
+    begin
+      result = yield f.path
+    ensure
+      f.unlink
+    end
+
+    result
+  end
+end

bolt-modules/file/spec/functions/file/with_tmpfile_spec.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'file::with_tmpfile' do
+  it do
+    is_expected.to run
+      .with_params('foo')
+      .with_lambda { |_| 'bar' }
+      .and_return('bar')
+  end
+end