[ubuntu] Rename build scripts (#8866)

* [ubuntu] Rename build scripts

* [ubuntu] Change reboot to inline shell

* [ubuntu] Move disk space validation to pester tests

* [ubuntu] Rename helper and tests files

* [ubuntu] Changes to cleanup, post-deployment and r scripts

images/ubuntu/scripts/build/configure-system.sh

@@ -0,0 +1,31 @@
+#!/bin/bash -e
+################################################################################
+##  File: configure-system.sh
+##  Desc: Post deployment system configuration actions
+################################################################################
+
+mv -f /imagegeneration/post-generation /opt
+
+echo "chmod -R 777 /opt"
+chmod -R 777 /opt
+echo "chmod -R 777 /usr/share"
+chmod -R 777 /usr/share
+
+chmod 755 $IMAGE_FOLDER
+
+# Remove quotes around PATH
+ENVPATH=$(grep 'PATH=' /etc/environment | head -n 1 | sed -z 's/^PATH=*//')
+ENVPATH=${ENVPATH#"\""}
+ENVPATH=${ENVPATH%"\""}
+echo "PATH=$ENVPATH" | sudo tee -a /etc/environment
+echo "Updated /etc/environment: $(cat /etc/environment)"
+
+# Сlean yarn and npm cache
+if yarn --version > /dev/null
+then
+  yarn cache clean
+fi
+if npm --version
+then
+  npm cache clean --force
+fi