Add Dockerfile

Dockerfile

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+FROM ghcr.io/anomalyco/opencode:latest
+
+# glibc compat for native binaries
+RUN apk add --no-cache gcompat nodejs curl npm
+
+# Bun runtime (opencode-mem plugin needs it)
+ARG BUN_VERSION=1.3.9
+RUN wget -qO /tmp/bun.zip "https://github.com/oven-sh/bun/releases/download/bun-v${BUN_VERSION}/bun-linux-x64.zip" && \
+    unzip -o /tmp/bun.zip -d /tmp/ && \
+    cp /tmp/bun-linux-x64/bun /usr/local/bin/bun && \
+    chmod +x /usr/local/bin/bun && \
+    rm -rf /tmp/bun* && \
+    bun --version
+
+# CodeGraph (runs via system node, not its bundled glibc binary)
+RUN npm install -g @colbymchenry/codegraph @colbymchenry/codegraph-linux-x64 && \
+    node -e "require('@colbymchenry/codegraph')"