new update new dependecies

Dockerfile

@@ -16,9 +16,25 @@ RUN apt-get update \
       python3-pycryptodome \
       python3-cryptography
 
+# Docker Engine for docker-in-docker. Only started when CCC_DIND=1 (needs --privileged).
+RUN install -m 0755 -d /etc/apt/keyrings \
+ && curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc \
+ && echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian $(. /etc/os-release && echo "$VERSION_CODENAME") stable" \
+      > /etc/apt/sources.list.d/docker.list \
+ && apt-get update \
+ && apt-get install -y --no-install-recommends \
+      docker-ce \
+      docker-ce-cli \
+      containerd.io \
+      docker-buildx-plugin \
+      docker-compose-plugin \
+      iptables \
+      kmod
+
 RUN npm install -g @anthropic-ai/claude-code && npm cache clean --force
 
 COPY sandbox-prompt.md /etc/ccc/sandbox-prompt.md
+COPY sandbox-prompt-dind.md /etc/ccc/sandbox-prompt-dind.md
 COPY entrypoint.sh /usr/local/bin/ccc-entrypoint
 RUN chmod +x /usr/local/bin/ccc-entrypoint