fix: non-members can view notice posts

Author: InJun2

src/main/java/org/poolc/api/post/service/PostService.java

@@ -35,7 +35,7 @@ public class PostService {
     public Post findById(Member member, Long postId) {
         Post post = postRepository.findById(postId)
                 .orElseThrow(() -> new NoSuchElementException("No post found with given post id."));
-        checkReadPermission(member, post.getBoardType());
+        if (post.getBoardType() != BoardType.NOTICE) checkReadPermission(member, post.getBoardType());
         post.getCommentList().sort(Comparator.comparing(Comment::getCreatedAt));
         return post;
     }
@@ -154,7 +154,7 @@ private boolean checkReadPermissionBoolean(Member user, BoardType board) {
     }
 
     private boolean checkWritePermissionBoolean(Member user, BoardType board) {
-        return user != null && user.isMember() && (user.isAdmin() || board != BoardType.NOTICE);
+        return user != null && user.isMember();
     }
 
     private void checkWriter(Member member, Post post) {