chore: adds lesson_12 push and pr checks

Signed-off-by: Anthony D. Mays <[email protected]>

Author: anthonydmays

.github/workflows/check_push.yml

@@ -13,6 +13,8 @@ on:
       - "lesson_10/libraries/**"
       - "lesson_11/arrays_java/**"
       - "lesson_11/arrays_ts/**"
+      - "lesson_12/structs_java/**"
+      - "lesson_12/structs_ts/**"
 
 jobs:
   build: