feat: Do nothing if scl file already exists

Author: clepski

repository-postgresql/src/main/resources/org/lfenergy/compas/scl/data/repository/postgresql/db/migration/V1_5__insert_lnode_library.sql

@@ -254,4 +254,5 @@ insert into scl_file(
 			<EnumVal ord="3">both</EnumVal>
 		</EnumType>
 	</DataTypeTemplates>
-</SCL>');
+</SCL>')
+        on duplicate key update id=id;