Add Pulumi to Ubuntu images (#1428)

* Add Pulumi to ubuntu images

* remove Pulumi from docs because it is auto-documented

* change Pulumi installation script

* removed legacy install, use /tmp, change auto-documentation, use download function instead of curl

* include install.sh to Pulumi's installation script

Co-authored-by: Leonid Lapshin <originalnoe-nazvanie@yandex.ru>

images/linux/scripts/installers/pulumi.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+################################################################################
+##  File:  pulumi.sh
+##  Desc:  Installs Pulumi
+################################################################################
+
+# Source the helpers for use with the script
+source $HELPER_SCRIPTS/document.sh
+source $HELPER_SCRIPTS/install.sh
+
+# Install Pulumi
+VERSION=$(curl --fail --silent -L "https://www.pulumi.com/latest-version")
+TARBALL_URL="https://get.pulumi.com/releases/sdk/pulumi-v${VERSION}-linux-x64.tar.gz"
+download_with_retries ${TARBALL_URL} "/tmp" pulumi-v${VERSION}.tar.gz
+tar --strip=1 -xvf /tmp/pulumi-v${VERSION}.tar.gz -C /usr/local/bin
+
+# Run tests to determine that the software installed as expected
+echo "Testing to make sure that script performed as expected, and basic scenarios work"
+if ! command -v pulumi ; then
+    echo "Pulumi was not installed"
+    exit 1
+fi
+
+# Document what was added to the image
+echo "Lastly, documenting what we added to the metadata file"
+DocumentInstalledItem "Pulumi $(pulumi version)"