build a template website

backup/Dockerfile

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+FROM postgres:16-alpine
+RUN apk add --no-cache rsync openssh-client
+COPY backup/backup.sh backup/entrypoint.sh /backup/
+ENTRYPOINT ["/backup/entrypoint.sh"]

backup/backup.sh

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+#!/bin/sh
+set -eu
+. /etc/backup.env
+
+push() { [ -n "${KUMA_BACKUP_PUSH_URL:-}" ] && wget -qO- "$KUMA_BACKUP_PUSH_URL?status=$1&msg=$2" >/dev/null 2>&1 || true; }
+
+run() {
+  f="/tmp/rainhub-$(date +%Y%m%d-%H%M%S).dump"
+  PGPASSWORD="$POSTGRES_PASSWORD" pg_dump -h db -U "$POSTGRES_USER" -Fc "$POSTGRES_DB" > "$f"
+  rsync -e "ssh -i /ssh/id_ed25519 -p ${BACKUP_PORT:-22} -o StrictHostKeyChecking=accept-new" "$f" "$BACKUP_TARGET/"
+  rm -f "$f"
+}
+
+if run; then push up OK; echo "backup ok"; else push down backup-failed; echo "backup FAILED"; exit 1; fi

backup/entrypoint.sh

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+#!/bin/sh
+printenv | sed "s/'/'\\\\''/g; s/^\([^=]*\)=\(.*\)$/export \1='\2'/" > /etc/backup.env
+echo "0 3 * * * /backup/backup.sh >> /proc/1/fd/1 2>&1" | crontab -
+exec crond -f -l 8