Add skip install flag to generate_metadata script

tools/scripts/generate_metadata.sh

@@ -9,7 +9,39 @@ echo $generated_dir
 resources_dir="$project_home/resources"
 rust_build_jar="$javadir/rust-build/target/rust-build-1.0-SNAPSHOT-jar-with-dependencies.jar"
 
+copyright_header="\
+// Copyright (C) 2009 The Libphonenumber Authors
+// Copyright (C) 2025 The Kashin Vladislav (Rust adaptation author)
+//
+// Licensed under the Apache License, Version 2.0 (the \"License\");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an \"AS IS\" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+"
+
+skip_install=false
+
+# Loop through all the command-line arguments
+for arg in "$@"
+do
+    if [ "$arg" == "--skip-install" ]
+    then
+        skip_install=true
+        # You can break the loop once the flag is found if you don't need to process further arguments
+        break
+    fi
+done
+
+if [[ $skip_install == false ]]; then
     mvn -f "$javadir/pom.xml" install
+fi
 mkdir -p "$generated_dir"
 
 function generate {
@@ -29,6 +61,8 @@ generate "PhoneNumberMetadataForTesting.xml" "test_metadata" "metadata" "TEST_ME
 
 # remove unnecessary nesting with pub use
 echo "\
+$copyright_header
+
 mod metadata;
 mod test_metadata;