First try

Dockerfile

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+FROM debian:bookworm-slim
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install dependencies
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends git ca-certificates curl unzip bash gnupg \
+ && rm -rf /var/lib/apt/lists/*
+
+# Install Hugo (Linux 64bit)
+RUN curl -fsSL "https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_${HUGO_VERSION}_Linux-64bit.tar.gz" \
+    | tar -xzf - -C /tmp \
+ && mv /tmp/hugo /usr/local/bin/hugo \
+ && chmod +x /usr/local/bin/hugo \
+ && rm -rf /tmp/hugo
+
+# Install adnanh/webhook binary
+RUN curl -fsSL "https://github.com/adnanh/webhook/releases/download/${WEBHOOK_VERSION}/webhook-linux-amd64.tar.gz" \
+    | tar -xzf - -C /tmp \
+ && mv /tmp/webhook-linux-amd64/webhook /usr/local/bin/webhook \
+ && chmod +x /usr/local/bin/webhook \
+ && rm -rf /tmp/webhook-linux-amd64
+
+# App layout
+WORKDIR /app
+COPY entrypoint.sh /app/entrypoint.sh
+COPY hooks/update_site.sh /app/hooks/update_site.sh
+RUN chmod +x /app/entrypoint.sh /app/hooks/update_site.sh
+
+EXPOSE 1313 ${WEBHOOK_PORT}
+
+ENTRYPOINT ["/app/entrypoint.sh"]