Added inital Jenkinsfile

The jenkinsfile can  build packages for x86_64,aarch64, armhf  and armv7
And collect the packages as artifacts in Jenkins

ExampleSetupJenkinsChroot.sh

@@ -0,0 +1,37 @@
+#!/bin/ash
+Arch=armv7
+Name=$Arch
+chrootDir=/chroot/$Name 
+
+#Setup core
+apk -X http://192.168.1.3/alpine/v3.18/main -U --allow-untrusted -p ${chrootDir} --arch ${Arch} --initdb add alpine-base git doas doas-sudo-shim alpine-sdk
+
+#Create required device nodes
+mknod -m 666 ${chrootDir}/dev/full c 1 7
+mknod -m 666 ${chrootDir}/dev/ptmx c 5 2
+mknod -m 644 ${chrootDir}/dev/random c 1 8
+mknod -m 644 ${chrootDir}/dev/urandom c 1 9
+mknod -m 666 ${chrootDir}/dev/zero c 1 5
+mknod -m 666 ${chrootDir}/dev/tty c 5 0
+
+#Setup DNS
+cp -L /etc/resolv.conf ${chrootDir}/etc/
+
+#Setup Repo
+mkdir -p ${chrootDir}/etc/apk 
+cp -L /etc/apk/repositories ${chrootDir}/etc/apk/repositories
+
+#Install config files 
+echo  "PS1='(Chroot-$Name)Test:\w\$ '" >>  ${chrootDir}/etc/profile
+cp -L -p /etc/doas.d/jenkinsAPKbuilder.conf ${chrootDir}/etc/doas.d/jenkinsAPKbuilder.conf
+
+#Setup user
+echo "jenkins:x:1000:1000::/home/jenkins:/bin/sh" >> ${chrootDir}/etc/passwd
+echo "jenkins:x:1000:" >> ${chrootDir}/etc/group
+sed -i 's/abuild.*/abuild:x:300:jenkins/' ${chrootDir}/etc/group
+mkdir -p ${chrootDir}/home/jenkins 
+chown jenkins:jenkins ${chrootDir}/home/jenkins
+cp -L -r /home/jenkins/.abuild ${chrootDir}/home/jenkins/
+
+chgrp abuild ${chrootDir}/var/cache/distfiles
+chmod g+w ${chrootDir}/var/cache/distfiles