Include applicant's username in staff application emails and Discord notifications.

database/src/main/java/com/alttd/altitudeweb/database/luckperms/UUIDUsernameMapper.java

@@ -0,0 +1,13 @@
+package com.alttd.altitudeweb.database.luckperms;
+
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
+
+public interface UUIDUsernameMapper {
+    @Select("""
+            SELECT username
+            FROM luckperms_players
+            WHERE uuid = #{uuid}
+            """)
+    String getUsernameFromUUID(@Param("uuid") String uuid);
+}

database/src/main/java/com/alttd/altitudeweb/setup/InitializeLuckPerms.java

@@ -2,6 +2,7 @@ package com.alttd.altitudeweb.setup;
 
 import com.alttd.altitudeweb.database.Databases;
 import com.alttd.altitudeweb.database.luckperms.TeamMemberMapper;
+import com.alttd.altitudeweb.database.luckperms.UUIDUsernameMapper;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
@@ -11,6 +12,7 @@ public class InitializeLuckPerms {
         log.info("Initializing LuckPerms");
         Connection.getConnection(Databases.LUCK_PERMS, (configuration) -> {
             configuration.addMapper(TeamMemberMapper.class);
+            configuration.addMapper(UUIDUsernameMapper.class);
         }).join();
         log.debug("Initialized LuckPerms");
     }