upgrade_oniro: add --dry-run option

The --dry-run option is not yet implemented but with
this commit it has been added to the list of parsed options.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

scripts/upgrade_oniro/upgrade_oniro.py

@@ -12,7 +12,8 @@
 #   1.4. Optional: Conf directory path, this can be specified in order to use a specific config directory.
 #                   In case we have a clean build directory and this is not specified the default config will be used.
 #   1.5. Optional: Flavour. In case the conf directory is not specified and the build directory is empty it becomes mandatory
-#   1.6. Some other stuff to control the output of the tool (TBD)
+#   1.6. Optional Flag: --dry-run: this enables the upgrade tool to create a local copy of the project and perform the upgrade on it.
+#   1.7. Some other stuff to control the output of the tool (TBD)
 #
 # 2. Check for tool updates. If the newest version of Oniro has a new version of this script it should be upgraded before
 #       Oniro's upgrade, then it should be run instead of the old one.
@@ -54,6 +55,7 @@ machine = ""
 flavour = ""
 image = ""
 conf_directory = pathlib.Path()
+dry_run = False
 
 def init_script_options():
     parser = argparse.ArgumentParser(description=script_description)
@@ -75,16 +77,19 @@ def init_script_options():
                         help = "The image that will be built to check if the upgrade is successful (oniro-image-base by default)")
     parser.add_argument("-c", "--conf-directory", type=pathlib.Path,
                         help="Path to the config directory you want to use. If omitted the default configs will be use.")
+    parser.add_argument("--dry-run", action="store_true",
+                        help="Perform the upgrade on a local copy of the project.")
     
 
     parsed_args = vars(parser.parse_args())
-    global target_version, build_directory, machine, flavour, image, conf_directory
+    global target_version, build_directory, machine, flavour, image, conf_directory, dry_run
     target_version = parsed_args["target-version"]
     build_directory = parsed_args["build-directory"]
     machine = parsed_args["machine"]
     flavour = parsed_args["flavour"]
     image = parsed_args["image"]
     conf_directory = parsed_args["conf_directory"]
+    dry_run = parsed_args["dry_run"]
 
 def upgrade_tool():
     # TODO