added based server template

Dockerfile

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+FROM ubuntu:20.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update && apt install -y \
+    curl \
+    ca-certificates \
+    lib32gcc-s1 \
+    lib32stdc++6 \
+    unzip \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p /steamcmd /hlds
+
+WORKDIR /steamcmd
+
+RUN curl -sSL https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz | tar -xz
+
+RUN ./steamcmd.sh +login anonymous \
+    +force_install_dir /hlds \
+    +app_update 90 validate \
+    +quit
+
+RUN mkdir -p /root/.steam/sdk32 && \
+    ln -sf /hlds/steamclient.so /root/.steam/sdk32/steamclient.so
+
+COPY start.sh /start.sh
+RUN chmod +x /start.sh
+ENTRYPOINT ["/start.sh"]
+
+EXPOSE 27015/udp
+EXPOSE 27020/udp
+
+SHELL ["/bin/bash", "-c"]

docker-compose.yml

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+version: "3.9"
+
+services:
+  csdm_1:
+    build: ./csserver
+    container_name: csdm-1
+    ports:
+      - "${PORT}:${PORT}/udp"
+      - "${HLTV_PORT}:${HLTV_PORT}/udp"
+    restart: unless-stopped
+    environment:
+      MAP: "de_dust2"
+      MAXPLAYERS: "16"
+      PORT: "27015"
+      HLTV_PORT: "27020"
+      RCON_PASSWORD: "bro1337"
+      SV_LAN: "0"
+      VAC: "insecure"

start.sh

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+#!/bin/bash
+
+cd /hlds
+
+./hlds_run \
+    -game cstrike \
+    +maxplayers ${MAXPLAYERS:-16} \
+    +map ${MAP:-de_dust2} \
+    +sv_lan 0 \
+    +rcon_password ${RCON_PASSWORD:-changeme} \
+    -port ${PORT:-27015} \
+    -${VAC:-insecure}