feat: add backups feature

deploy/docker/Dockerfile

@@ -53,6 +53,20 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 
 WORKDIR /app
 
+RUN set -eux; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends ca-certificates curl gnupg; \
+    . /etc/os-release; \
+    install -d /usr/share/postgresql-common/pgdg; \
+    curl -fsSL https://www.postgresql.org/media/keys/ACCC4CF8.asc \
+      | gpg --dearmor -o /usr/share/postgresql-common/pgdg/apt.postgresql.org.gpg; \
+    echo "deb [signed-by=/usr/share/postgresql-common/pgdg/apt.postgresql.org.gpg] https://apt.postgresql.org/pub/repos/apt ${VERSION_CODENAME}-pgdg main" \
+      > /etc/apt/sources.list.d/pgdg.list; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends postgresql-client-17; \
+    apt-get purge -y --auto-remove curl gnupg; \
+    rm -rf /var/lib/apt/lists/*
+
 RUN useradd -u 10001 -m appuser
 
 COPY backend/requirements.txt backend/requirements.txt