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+# ---- Stage 1: Fetch Mattermost + MostlyMatter ----
+    FROM debian:bookworm-slim AS fetcher
+
+    ARG MOSTLYMATTER_VERSION=v10.11.3
+    ARG MATTERMOST_VERSION=10.11.3
+    
+    ARG MM_DOWNLOAD_URL=https://releases.mattermost.com/${MATTERMOST_VERSION}/mattermost-${MATTERMOST_VERSION}-linux-amd64.tar.gz
+    ARG MOSTLY_DOWNLOAD_URL=https://packages.framasoft.org/projects/mostlymatter/mostlymatter-amd64-${MOSTLYMATTER_VERSION}
+    
+    RUN apt-get update && apt-get install -y --no-install-recommends \
+        curl ca-certificates tar \
+        && rm -rf /var/lib/apt/lists/*
+    
+    WORKDIR /tmp
+    
+    # Download and extract official Mattermost release
+    RUN curl -L $MM_DOWNLOAD_URL | tar -xz
+    
+    # Download MostlyMatter binary and overwrite Mattermost's binary
+    RUN curl -L -o mostlymatter $MOSTLY_DOWNLOAD_URL && \
+        chmod +x mostlymatter && \
+        mv mostlymatter mattermost/bin/
+    
+    
+    # ---- Stage 2: Runtime container ----
+    FROM debian:bookworm-slim
+    
+    # Add runtime deps for Mattermost
+    RUN apt-get update && apt-get install -y --no-install-recommends \
+        ca-certificates tzdata \
+        && rm -rf /var/lib/apt/lists/*
+    
+    # Create mattermost user
+    RUN useradd --system --create-home --uid 2000 mattermost
+    
+    WORKDIR /mattermost
+    
+    # Copy prepared Mattermost tree with MostlyMatter binary inside
+    COPY --from=fetcher /tmp/mattermost /mattermost
+    
+    # Adjust permissions
+    RUN chown -R mattermost:mattermost /mattermost
+    
+    USER mattermost
+    
+    EXPOSE 8065
+    
+    ENTRYPOINT ["/mattermost/bin/mostlymatter"]
+    CMD ["server"]
+