scripts: Return non-zero error code, unless stdin is empty

Author: JDBetteridge

scripts/typos_json_to_gha.py

@@ -4,13 +4,16 @@
 
 
 def main():
+    error_code = 0
+
     # Standard Github message template for CI annotations
     message_template = Template(
         '::error file=$path,line=$line_num,col=$byte_offset,endcol=$end_col,'
         'title=$type::`$typo` should be $suggestions'
     )
 
     for line in sys.stdin:
+        error_code = 1
         # Grab the JSON data coming from typos from stdin
         data = json.loads(line.rstrip())
 
@@ -34,6 +37,8 @@ def main():
             print(f'{data}')
             print(f'{e}')
 
+    return error_code
+
 
 if __name__ == '__main__':
     exit(main())