refactor: 멘토의 합격 팁, 자기 소개가 null 을 허용하지 않도록 (#443)

* chore: not null alter 스크립트 추가

* refactor: 엔티티에 nullable=false 추가

* chore: flyway 버전업

Author: nayonsoso

src/main/java/com/example/solidconnection/mentor/domain/Mentor.java

@@ -32,10 +32,10 @@ public class Mentor {
     @Column
     private boolean hasBadge = false;
 
-    @Column(length = 1000)
+    @Column(length = 1000, nullable = false)
     private String introduction;
 
-    @Column(length = 1000)
+    @Column(length = 1000, nullable = false)
     private String passTip;
 
     @Column

src/main/resources/db/migration/V29__alter_mentor_introduction_pass_tip_not_null.sql

@@ -0,0 +1,5 @@
+ALTER TABLE mentor
+    MODIFY introduction VARCHAR(1000) NOT NULL;
+
+ALTER TABLE mentor
+    MODIFY pass_tip VARCHAR(1000) NOT NULL;