fixed the Dockerfile, aperently the server has to be installed at runtime and there was also an issue with permissions which can be fixed by manually creating the direcotry data with the correct permissions. If you dont do this it will install in the default directory.

There is currently an issue with the server crashing everytime i try to join, no idea why it happens...

Dockerfile

@@ -1,17 +1,18 @@
 ############################################################
-# Dockerfile that contains SteamCMD
+# Counter-Strike dedicated server
 ############################################################
-FROM debian:bookworm-slim as build_stage
+FROM debian:bookworm-slim
 
 LABEL maintainer="admin@based.pt"
-ARG PUID=1000
 
-ENV USER steam
-ENV HOMEDIR "/home/${USER}"
-ENV STEAMCMDDIR "${HOMEDIR}/steamcmd"
+ARG PUID=1000
+ENV USER=steam \
+    HOMEDIR=/home/steam \
+    STEAMCMDDIR=/home/steam/steamcmd \
+    PORT=27015 \
+    DATADIR=/data
 
 RUN set -x \
-	# Install, update & upgrade packages
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends --no-install-suggests \
 		lib32stdc++6=12.2.0-14+deb12u1 \
@@ -22,9 +23,9 @@ RUN set -x \
 		locales=2.36-9+deb12u13 \
 	&& sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen \
 	&& dpkg-reconfigure --frontend=noninteractive locales \
-	# Create unprivileged user
 	&& useradd -u "${PUID}" -m "${USER}" \
-	# Download SteamCMD, execute as user
+  && mkdir -p "${STEAMCMDDIR}" "${DATADIR}" \
+  && chown -R "${USER}:${USER}" "${HOMEDIR}" "${DATADIR}" \
 	&& su "${USER}" -c \
 		"mkdir -p \"${STEAMCMDDIR}\" \
                 && curl -fsSL 'https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz' | tar xvzf - -C \"${STEAMCMDDIR}\" \
@@ -37,34 +38,14 @@ RUN set -x \
                 && ln -s \"${STEAMCMDDIR}/linux64/steamclient.so\" \"${HOMEDIR}/.steam/sdk64/steamclient.so\" \
                 && ln -s \"${STEAMCMDDIR}/linux64/steamcmd\" \"${STEAMCMDDIR}/linux64/steam\" \
                 && ln -s \"${STEAMCMDDIR}/steamcmd.sh\" \"${STEAMCMDDIR}/steam.sh\"" \
-	# Symlink steamclient.so; So misconfigured dedicated servers can find it
  	&& ln -s "${STEAMCMDDIR}/linux64/steamclient.so" "/usr/lib/x86_64-linux-gnu/steamclient.so" \
 	&& rm -rf /var/lib/apt/lists/*
 
-FROM build_stage AS steamcmd
-
-###########################################################
-# HALF-LIFE SERVER
-##########################################################
-
-FROM steamcmd AS hlds
-
-# Define variables
-ENV STEAMAPPID 90
-ENV STEAMAPPDIR "data/hlds"
-ENV PORT 27015
-
 USER ${USER}
-
 WORKDIR ${HOMEDIR}
 
-# Install Half-Life Dedicated Server (HLDS) for Counter-Strike
-RUN mkdir -p ${STEAMAPPDIR} \
-		&& ${STEAMCMDDIR}/steamcmd.sh +force_install_dir ${STEAMAPPDIR} +login anonymous  +app_update 90 +quit
+EXPOSE ${PORT}/udp
+VOLUME ["/data"]
 
-# Expose necessary ports for the game
-EXPOSE ${PORT}
-
-# Run HLDS with the Counter-Strike mod
-ENTRYPOINT ["${STEAMAPPDIR}/hlds_run", "-game", "cstrike", "-console", "-port", "${PORT}", "-steam_dir", "${STEAMCMDDIR}", "-steamcmd_script", "${STEAMCMDDIR}/steamcmd.sh"]
+ENTRYPOINT ["/bin/bash", "-c", "/home/steam/steamcmd/steamcmd.sh +force_install_dir /data +login anonymous +app_set_config 90 mod cstrike +app_update 90 validate +quit && cd /data && exec bash hlds_run -game cstrike -console +ip 0.0.0.0 -port ${PORT}"]
 

docker-compose.yml

@@ -4,8 +4,11 @@ services:
   counter-strike:
     build: .
     container_name: counter-strike
+    stop_signal: SIGKILL
     ports:
-      - "27016:27015/udp"
+      - "27016:27016/udp"
+    environment:
+      - PORT=27016
     volumes:
       - ./data:/data
     restart: always