Add Jenkinsfile for build automation

.build/DEB/control

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+Package: rpxy
+Version: @BUILD_VERSION@-1
+Maintainer: Jun Kurihara <kurihara@ieee.org>
+Homepage: https://github.com/junkurihara/rust-rpxy
+Architecture: amd64
+Depends: systemd
+Recommends: rpxy-webui
+Priority: optional
+Section: base
+Description: A simple and ultrafast reverse-proxy serving multiple domain names with TLS termination, written in Rust

.build/DEB/postinst

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+#!/bin/bash
+
+set -e
+
+systemctl daemon-reload
+systemctl enable rpxy
+systemctl start rpxy
+
+exit 0

.build/DEB/prerm

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+#!/bin/bash
+
+set -e
+
+systemctl stop rpxy || true
+systemctl disable rpxy || true
+
+exit 0