Refactor Dockerfile and entrypoint: switch to a new base image, streamline .NET SDK installation, and enhance entrypoint script for better environment setup

entrypoint.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+cd /home/container
+
+# Set environment variable that holds the Internal Docker IP
+INTERNAL_IP=$(ip route get 1 | awk '{print $(NF-2);exit}')
+export INTERNAL_IP
+
+# set this variable, dotnet needs it even without it it reports to `dotnet --info` it can not start any aplication without this
+export DOTNET_ROOT=/usr/share/
+
+# Start Xvfb for Wine (virtual display)
+Xvfb :99 -screen 0 1024x768x16 &
+export DISPLAY=:99.0
+
+# print the dotnet version on startup
+printf "\033[1m\033[33mcontainer@pelican~ \033[0mdotnet --version\n"
+dotnet --version
+
+# print the wine version on startup
+printf "\033[1m\033[33mcontainer@pelican~ \033[0mwine --version\n"
+wine --version
+
+# Replace Startup Variables
+MODIFIED_STARTUP=$(echo -e ${STARTUP} | sed -e 's/{{/${/g' -e 's/}}/}/g')
+echo -e ":/home/container$ ${MODIFIED_STARTUP}"
+
+# Run the Server
+eval ${MODIFIED_STARTUP}