[Enhancement] support user custom defined privite settings,xml for build fe (#29015)

Issue Number: close #29014

build.sh

@@ -590,9 +590,18 @@ if [[ "${FE_MODULES}" != '' ]]; then
         clean_fe
     fi
     if [[ "${DISABLE_JAVA_CHECK_STYLE}" = "ON" ]]; then
-        "${MVN_CMD}" package -pl ${FE_MODULES:+${FE_MODULES}} -Dskip.doc=true -DskipTests -Dcheckstyle.skip=true ${MVN_OPT:+${MVN_OPT}}
+        # Allowed user customer set env param USER_SETTINGS_MVN_REPO means settings.xml file path
+        if [[ -n ${USER_SETTINGS_MVN_REPO} && -f ${USER_SETTINGS_MVN_REPO} ]]; then
+            "${MVN_CMD}" package -pl ${FE_MODULES:+${FE_MODULES}} -Dskip.doc=true -DskipTests -Dcheckstyle.skip=true ${MVN_OPT:+${MVN_OPT}} -gs "${USER_SETTINGS_MVN_REPO}"
+        else
+            "${MVN_CMD}" package -pl ${FE_MODULES:+${FE_MODULES}} -Dskip.doc=true -DskipTests -Dcheckstyle.skip=true ${MVN_OPT:+${MVN_OPT}}
+        fi
     else
-        "${MVN_CMD}" package -pl ${FE_MODULES:+${FE_MODULES}} -Dskip.doc=true -DskipTests ${MVN_OPT:+${MVN_OPT}}
+        if [[ -n ${USER_SETTINGS_MVN_REPO} && -f ${USER_SETTINGS_MVN_REPO} ]]; then
+            "${MVN_CMD}" package -pl ${FE_MODULES:+${FE_MODULES}} -Dskip.doc=true -DskipTests ${MVN_OPT:+${MVN_OPT}} -gs "${USER_SETTINGS_MVN_REPO}"
+        else
+            "${MVN_CMD}" package -pl ${FE_MODULES:+${FE_MODULES}} -Dskip.doc=true -DskipTests ${MVN_OPT:+${MVN_OPT}}
+        fi
     fi
     cd "${DORIS_HOME}"
 fi

docs/en/community/developer-guide/be-vscode-dev.md

@@ -93,6 +93,11 @@ Note: This compilation has the following instructions:
 
 If nothing happens, the compilation should be successful, and the final deployment file will be output to the /home/workspace/doris/output/ directory. If you still encounter other problems, you can refer to the doris installation document http://doris.apache.org.
 
+Note: If you want to specify the private maven repository address separately when compiling fe, you can set the environment variable USER_SETTINGS_MVN_REPO to specify the file path to settings.xml.
+Example:
+```
+  export USER_SETTINGS_MVN_REPO="/xxx/xxx/settings.xml"
+```
 ## Deployment and debugging(GDB)
 
 1. Authorize be compilation result files

docs/zh-CN/community/developer-guide/be-vscode-dev.md

@@ -92,6 +92,11 @@ cd /home/workspace/doris
 
 如果不出意外，应该会编译成功，最终的部署文件将产出到 /home/workspace/doris/output/ 目录下。如果还遇到其他问题，可以参照 doris 的安装文档 http://doris.apache.org。
 
+注意：如果编译fe时希望单独指定私有的maven仓地址，可以设置环境变量USER_SETTINGS_MVN_REPO指定settings.xml的文件路径。
+举例：
+```
+  export USER_SETTINGS_MVN_REPO="/xxx/xxx/settings.xml"
+```
 ## 部署调试(GDB)
 
 1. 给 be 编译结果文件授权