Initial Valheim dedicated server container with web UI scaffold

Dockerfile

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+FROM debian:12-slim
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV VALHEIM_SERVER_DIR=/opt/valheim
+ENV STEAMCMD_DIR=/opt/steamcmd
+ENV USER=valheim
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
+        wget \
+        jq \
+        lib32gcc-s1 \
+        tini \
+        procps \
+        iproute2 && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create user
+RUN useradd -m -d /home/${USER} -s /bin/bash ${USER}
+
+# Create directories
+RUN mkdir -p ${VALHEIM_SERVER_DIR} ${STEAMCMD_DIR}
+RUN chown -R ${USER}:${USER} /opt /home/${USER}
+
+USER ${USER}
+
+# Install SteamCMD
+RUN cd ${STEAMCMD_DIR} && \
+    wget https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz && \
+    tar -xvzf steamcmd_linux.tar.gz && \
+    rm steamcmd_linux.tar.gz
+
+# Copy entrypoint
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+EXPOSE 2456/udp 2457/udp 2458/udp
+EXPOSE 8080
+
+ENTRYPOINT ["/usr/bin/tini", "--"]
+CMD ["/entrypoint.sh"]

docker-compose.yml

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+version: "3.9"
+
+services:
+  valheim:
+    build: .
+    container_name: valheim
+    restart: unless-stopped
+    environment:
+      SERVER_NAME: "${SERVER_NAME}"
+      WORLD_NAME: "${WORLD_NAME}"
+      SERVER_PASSWORD: "${SERVER_PASSWORD}"
+    ports:
+      - "2456:2456/udp"
+      - "2457:2457/udp"
+      - "2458:2458/udp"
+      - "8080:8080"
+    volumes:
+      - valheim_data:/opt/valheim
+      - valheim_config:/home/valheim/.config/unity3d/IronGate/Valheim
+    networks:
+      - valheim_net
+
+volumes:
+  valheim_data:
+  valheim_config:
+
+networks:
+  valheim_net:
+    driver: bridge

entrypoint.sh

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+#!/bin/bash
+set -e
+
+VALHEIM_SERVER_DIR=${VALHEIM_SERVER_DIR:-/opt/valheim}
+STEAMCMD_DIR=${STEAMCMD_DIR:-/opt/steamcmd}
+
+echo "=== Updating Valheim Dedicated Server via SteamCMD ==="
+${STEAMCMD_DIR}/steamcmd.sh +login anonymous \
+    +force_install_dir ${VALHEIM_SERVER_DIR} \
+    +app_update 896660 validate \
+    +quit
+
+echo "=== Starting Web Management Interface ==="
+# Placeholder — you will replace with your actual web UI
+python3 /opt/webui/server.py &
+
+echo "=== Starting Valheim Server ==="
+cd ${VALHEIM_SERVER_DIR}
+
+./valheim_server.x86_64 \
+    -name "${SERVER_NAME}" \
+    -port 2456 \
+    -world "${WORLD_NAME}" \
+    -password "${SERVER_PASSWORD}" \
+    -public 1