[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/install-zstd.sh

@@ -0,0 +1,28 @@
+#!/bin/bash -e
+################################################################################
+##  File:  install-zstd.sh
+##  Desc:  Install zstd
+##  Supply chain security: zstd - checksum validation
+################################################################################
+
+# Source the helpers for use with the script
+source $HELPER_SCRIPTS/install.sh
+
+# Download zstd
+release_tag=$(curl -fsSL https://api.github.com/repos/facebook/zstd/releases/latest | jq -r '.tag_name')
+zstd_tar_name=zstd-${release_tag//v}.tar.gz
+URL=https://github.com/facebook/zstd/releases/download/${release_tag}/${zstd_tar_name}
+download_with_retries "${URL}" "/tmp" "${zstd_tar_name}"
+# Supply chain security - zstd
+external_hash=$(get_hash_from_remote_file "${URL}.sha256" "${zstd_tar_name}")
+use_checksum_comparison "/tmp/${zstd_tar_name}" "${external_hash}"
+# Install zstd
+apt-get install -y liblz4-dev
+tar xzf /tmp/$zstd_tar_name -C /tmp
+make -C /tmp/zstd-${release_tag//v}/contrib/pzstd all
+make -C /tmp/zstd-${release_tag//v} zstd-release
+for copyprocess in zstd zstdless zstdgrep; do cp /tmp/zstd-${release_tag//v}/programs/$copyprocess /usr/local/bin/; done
+cp /tmp/zstd-${release_tag//v}/contrib/pzstd/pzstd /usr/local/bin/
+for symlink in zstdcat zstdmt unzstd; do ln -sf /usr/local/bin/zstd /usr/local/bin/$symlink; done
+
+invoke_tests "Tools" "Zstd"