Fix: Fixed dev container

.devcontainer/Dockerfile

 # Development container for dotnet
-
 FROM mcr.microsoft.com/devcontainers/dotnet:8.0 as develop
 
-USER vscode
+ARG USERNAME=vscode
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+# Remove any existing user with the same UID (if it's not the specified user)
+RUN if id -u $USER_UID >/dev/null 2>&1; then \
+        existing_user=$(getent passwd $USER_UID | cut -d: -f1); \
+        if [ "$existing_user" != "$USERNAME" ]; then \
+            userdel -f $existing_user; \
+        fi; \
+    fi
+
+# Change the user's GID and UID
+RUN groupmod -g $USER_GID $USERNAME \
+    && usermod -u $USER_UID -g $USER_GID $USERNAME
+
+# Change user folder owner and group
+RUN chown -R $USER_GID:$USER_GID /home/$USERNAME
+
+# [Optional] Set the default user. Omit if you want to keep the default as root.
+USER $USERNAME 
 
 # Add nuget sources for private packages (here: api-client)
 RUN dotnet nuget add source "https://git.rwth-aachen.de/api/v4/projects/88930/packages/nuget/index.json" -n "api-client"
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