fastnetmon: add package build instructions

packages/fastnetmon/.gitignore

@@ -0,0 +1,7 @@
+fastnetmon/
+fastnetmon-debian-salsa/
+*.deb
+*.dsc
+*.buildinfo
+*.changes
+*.git

packages/fastnetmon/Jenkinsfile

@@ -0,0 +1,36 @@
+// Copyright (C) 2022 VyOS maintainers and contributors
+//
+// This program is free software; you can redistribute it and/or modify
+// in order to easy exprort images built to "external" world
+// it under the terms of the GNU General Public License version 2 or later as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+@NonCPS
+
+// Using a version specifier library, use 'current' branch. The underscore (_)
+// is not a typo! You need this underscore if the line immediately after the
+// @Library annotation is not an import statement!
+@Library('vyos-build@current')_
+
+// NOTE: we can build with -d as the libbpf dependency is installed manually
+// and not via a DEB package
+def pkgList = [
+    ['name': 'fastnetmon-debian-salsa',
+     'scmCommit': 'debian/1.2.1-1',
+     'scmUrl': 'https://salsa.debian.org/debian/fastnetmon.git'],
+
+    ['name': 'fastnetmon',
+     'scmCommit': 'v1.2.1',
+     'scmUrl': 'https://github.com/pavel-odintsov/fastnetmon.git',
+     'buildCmd': 'cd ..; ./build.sh'],
+]
+
+// Start package build using library function from https://github.com/vyos/vyos-build
+buildPackage('fastnetmon', pkgList, null, true, "**/packages/fastnetmon/*")

packages/fastnetmon/build.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+CWD=$(pwd)
+set -e
+
+SRC=fastnetmon
+if [ ! -d ${SRC} ]; then
+    echo "Source directory does not exists, please 'git clone'"
+    exit 1
+fi
+
+tar -czf fastnetmon_$(head -n 1 fastnetmon-debian-salsa/debian/changelog|awk '{print $2}'|sed 's/[()]//g' | sed -E 's/(\-[0-9]+)?$//').orig.tar.gz fastnetmon
+
+cd ${SRC}
+rm -rf debian && cp -a ../fastnetmon-debian-salsa/debian/ .
+
+dpkg-buildpackage -uc -us -tc -b -d