백업/복구로직 변경, 깜빡임 버그 해결

docker/backup-tools/Dockerfile

@@ -0,0 +1,24 @@
+FROM debian:trixie-slim
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        bash \
+        ca-certificates \
+        coreutils \
+        curl \
+        docker-cli \
+        findutils \
+        git \
+        grep \
+        jq \
+        openssl \
+        perl \
+        postgresql-client \
+        sed \
+        tar \
+        util-linux \
+        zstd \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /workspace
+CMD ["/bin/bash"]