fix: warning of no define maven compiler version

docker/copy.sh

@@ -17,7 +17,7 @@ cp ../sql/wfc_user_db/wfc_user_db.sql ./mysql/db
 echo "begin copy system html "
 mkdir -p ./nginx/html/dist/sys
 rm -rf ./nginx/html/dist/sys/*
-cp -rf ../../fe.wfc/dist ./nginx/html/dist/sys/
+cp -rf ../../fe.wfc/dist/* ./nginx/html/dist/sys/
 
 echo "begin copy user html "
 mkdir -p ./nginx/html/dist/u

pom.xml

@@ -37,6 +37,7 @@
         <lombok.version>1.18.36</lombok.version>
         <swagger.core.version>1.6.2</swagger.core.version>
         <mail.version>1.6.2</mail.version>
+        <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
 
         <!-- override dependency version -->
         <tomcat.version>9.0.96</tomcat.version>
@@ -330,6 +331,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
                 <configuration>
                     <source>${java.version}</source>
                     <target>${java.version}</target>