added based server template

Dockerfile

@@ -0,0 +1,34 @@
+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"]