Fix Label Checker test and improve license header script

Co-authored-by: simongdavies <[email protected]>
Signed-off-by: Simon Davies <[email protected]>

Author: Copilot

dev/check-license-headers.sh

@@ -8,6 +8,25 @@ cd "$REPO_ROOT" || exit 1
 # Define the license header pattern to look for
 LICENSE_PATTERN="Copyright .* The Hyperlight Authors..*Licensed under the Apache License, Version 2.0"
 
+# Define the full license header for files that need it
+LICENSE_HEADER='/*
+Copyright 2024 The Hyperlight Authors.
+
+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.
+*/
+
+'
+
 # Initialize a variable to track missing headers
 MISSING_HEADERS=0
 MISSING_FILES=""
@@ -30,6 +49,10 @@ done < <(find src -name "*.rs" -type f)
 if [ $MISSING_HEADERS -gt 0 ]; then
     echo "Found $MISSING_HEADERS files with missing or invalid license headers:"
     echo -e "$MISSING_FILES"
+    echo ""
+    echo "Please add the following license header to these files:"
+    echo "$LICENSE_HEADER"
+    echo "You can also run: just check-license-headers to verify your changes."
     exit 1
 else
     echo "All Rust files have the required license header"