feat: ✨ Add run and build time check for $GAME

Dockerfile

@@ -2,6 +2,8 @@ FROM ubuntu:18.04
 
 ARG GAME
 
+RUN if [ -z "$GAME" ]; then echo "The GAME environment variable is not set. Please specify one and try again." && exit 1; fi
+
 RUN dpkg --add-architecture i386 && \
     apt-get update && \
     apt-get install -y --no-install-recommends curl file libc6:i386 lib32stdc++6 ca-certificates rsync && \

entrypoint.sh

@@ -1,10 +1,17 @@
 #!/usr/bin/env sh
 
+if [ -z "$GAME" ]; then 
+  echo "The GAME environment variable is not set. Script execution cancelled."
+  exit 1
+fi
+
 if [ -d /temp/hlds ]
 then
   rsync --chown=steam:steam /temp/hlds/* /opt/steam/hlds/$GAME
 fi
 
+
+
 echo Starting Half-Life Dedicated Server...
 
 ./hlds_run "-game $GAME $@"