Ensure checkmode is honored for templates that haven't changed

Fixes #8998

lib/ansible/runner/action_plugins/template.py

@@ -132,5 +132,12 @@ class ActionModule(object):
                     res.diff = dict(before=dest_contents, after=resultant)
                 return res
         else:
+            # if we're running in check mode, we still want the file module
+            # to execute, since we can't know if anything would be changed here,
+            # so we inject the check mode param into the module args and rely on
+            # the file module to report its changed status
+            if self.runner.noop_on_check(inject):
+                new_module_args = dict(CHECKMODE=True)
+                module_args = utils.merge_module_args(module_args, new_module_args)
             return self.runner._execute_module(conn, tmp, 'file', module_args, inject=inject, complex_args=complex_args)