T5086: Add Jenkins build for hsflowd deb pkg

Build 'hsflofd' from sources

packages/hsflowd/.gitignore

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+hsflowd/

packages/hsflowd/Jenkinsfile

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+// Copyright (C) 2023 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': 'hsflowd',
+     'scmCommit': 'v2.0.47-1',
+     'scmUrl': 'https://github.com/sflow/host-sflow.git',
+     'buildCmd': 'cd ..; ./build.sh'],
+]
+
+// Start package build using library function from https://github.com/vyos/vyos-build
+buildPackage('hsflowd', pkgList, null, true, "**/packages/hsflowd/*")

packages/hsflowd/build.sh

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+#!/bin/sh -x
+CWD=$(pwd)
+set -e
+
+SRC=host-sflow
+
+if [ ! -d ${SRC} ]; then
+    echo "source directory does not exists, please 'git clone'"
+    exit 1
+fi
+
+cd ${SRC}
+echo "I: Retrieve version information from Git"
+# Build hsflowd
+# make deb FEATURES="NFLOG PCAP TCP DOCKER KVM OVS DBUS SYSTEMD DROPMON PSAMPLE DENT CONTAINERD"
+echo "I: Build VyOS hsflowd Package"
+make deb FEATURES="PCAP"