refactor(sandbox): add sandbox-common dockerfile

Dockerfile.sandbox-common

@@ -0,0 +1,45 @@
+ARG BASE_IMAGE=openclaw-sandbox:bookworm-slim
+FROM ${BASE_IMAGE}
+
+USER root
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+ARG PACKAGES="curl wget jq coreutils grep nodejs npm python3 git ca-certificates golang-go rustc cargo unzip pkg-config libasound2-dev build-essential file"
+ARG INSTALL_PNPM=1
+ARG INSTALL_BUN=1
+ARG BUN_INSTALL_DIR=/opt/bun
+ARG INSTALL_BREW=1
+ARG BREW_INSTALL_DIR=/home/linuxbrew/.linuxbrew
+ARG FINAL_USER=sandbox
+
+ENV BUN_INSTALL=${BUN_INSTALL_DIR}
+ENV HOMEBREW_PREFIX=${BREW_INSTALL_DIR}
+ENV HOMEBREW_CELLAR=${BREW_INSTALL_DIR}/Cellar
+ENV HOMEBREW_REPOSITORY=${BREW_INSTALL_DIR}/Homebrew
+ENV PATH=${BUN_INSTALL_DIR}/bin:${BREW_INSTALL_DIR}/bin:${BREW_INSTALL_DIR}/sbin:${PATH}
+
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends ${PACKAGES} \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN if [ "${INSTALL_PNPM}" = "1" ]; then npm install -g pnpm; fi
+
+RUN if [ "${INSTALL_BUN}" = "1" ]; then \
+  curl -fsSL https://bun.sh/install | bash; \
+  ln -sf "${BUN_INSTALL_DIR}/bin/bun" /usr/local/bin/bun; \
+fi
+
+RUN if [ "${INSTALL_BREW}" = "1" ]; then \
+  if ! id -u linuxbrew >/dev/null 2>&1; then useradd -m -s /bin/bash linuxbrew; fi; \
+  mkdir -p "${BREW_INSTALL_DIR}"; \
+  chown -R linuxbrew:linuxbrew "$(dirname "${BREW_INSTALL_DIR}")"; \
+  su - linuxbrew -c "NONINTERACTIVE=1 CI=1 /bin/bash -c '$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)'"; \
+  if [ ! -e "${BREW_INSTALL_DIR}/Library" ]; then ln -s "${BREW_INSTALL_DIR}/Homebrew/Library" "${BREW_INSTALL_DIR}/Library"; fi; \
+  if [ ! -x "${BREW_INSTALL_DIR}/bin/brew" ]; then echo \"brew install failed\"; exit 1; fi; \
+  ln -sf "${BREW_INSTALL_DIR}/bin/brew" /usr/local/bin/brew; \
+fi
+
+# Default is sandbox, but allow BASE_IMAGE overrides to select another final user.
+USER ${FINAL_USER}
+