backup/Dockerfile

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# PulseBase backup sidecar: pg_dump (PG16) + age encryption + optional rclone offsite.
# Connects to the db service over the internal network (no docker socket, no extra privilege).
FROM postgres:18-alpine@sha256:10a5c69a83035ab5239f5620d708520e8b28f5aa1f2b20143e6024532edadfb5

# age   = backup encryption (X25519 / ChaCha20-Poly1305), Alpine community
# rclone = optional offsite copy (3-2-1 rule)
RUN apk upgrade --no-cache && apk add --no-cache age rclone && \
    rm -f /usr/local/bin/gosu

COPY backup.sh restore.sh entrypoint.sh /scripts/
RUN chmod +x /scripts/*.sh \
    && mkdir -p /backups \
    && chown -R postgres:postgres /backups /scripts

# Run as the image's existing non-root postgres user (uid 70). A fresh named volume
# mounted at /backups inherits this ownership, so backups are writable without root.
USER postgres

# Liveness: the scheduler loop must be alive.
HEALTHCHECK --interval=1m --timeout=5s --start-period=10s \
    CMD pgrep -f entrypoint.sh >/dev/null || exit 1

ENTRYPOINT ["/scripts/entrypoint.sh"]