update devcontainer

.devcontainer/server/Dockerfile

@@ -0,0 +1,16 @@
+FROM mcr.microsoft.com/openjdk/jdk:21-ubuntu
+
+# Set build arguments for username, UID, and GID
+ARG USERNAME=java
+ARG USER_UID=1000
+ARG USER_GID=1000
+
+# Create the user and group with the specified UID and GID
+RUN groupadd --gid $USER_GID $USERNAME \
+    && useradd --uid $USER_UID --gid $USER_GID -m $USERNAME
+
+# Set the default user
+USER $USERNAME
+
+# Set the working directory
+WORKDIR /home/$USERNAME

.devcontainer/server/devcontainer.json

@@ -1,6 +1,8 @@
 {
   "name": "OpenJDK21",
-  "image": "mcr.microsoft.com/openjdk/jdk:21-ubuntu",
+  "build": {
+    "dockerfile": "Dockerfile",
+  },
   "features": {
     "ghcr.io/devcontainers/features/java:1": {
       "installMaven": "true"