Add NFPM packaging recipe

misc/ci/Dockerfile

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+FROM alpine:3.15
+
+RUN apk add --no-cache make git curl jq bash openssl
+
+RUN curl -k https://forge.cadoles.com/Cadoles/Jenkins/raw/branch/master/resources/com/cadoles/common/add-letsencrypt-ca.sh | bash
+
+RUN wget https://github.com/goreleaser/nfpm/releases/download/v2.20.0/nfpm_2.20.0_Linux_x86_64.tar.gz \
+    && tar -xzf nfpm_2.20.0_Linux_x86_64.tar.gz -C /usr/local/bin \
+    && chmod +x /usr/local/bin/nfpm

misc/packaging/postgres-backup.service

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+[Unit]
+Description=Run PostgreSQL backup
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/pg_backup_rotated.sh -c /etc/postgres-backup/pg_backup.conf
+User=postgres
+
+[Install]
+WantedBy=default.target

misc/packaging/postgres-backup.timer

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+[Unit]
+Description=Timer for periodic execution of postgres-backup service.
+
+[Timer]
+OnCalendar=daily
+Persistent=true
+
+[Install]
+WantedBy=timers.target