Install packer on build agent - issue #280 (#295)

* create packer.sh deployment file

Copy from terraform.sh

* add packer.sh to provisioner

add packer.sh script to provisioner to install packer.

* add packer.sh to provisioner

Add packer.sh script to provisioner to install packer

* remove blank lines

removed blank lines as requested in feedback by alepauly.

* remove additional blank lines

* Add Install-Packer.ps1

This script installs packer on Windows through chocolatey

* Create Validate-Packer.ps1

This script validates the installation of Packer from Install-Packer.ps1 and adds the software details to the markdown files.

* Add Packer install and validate script

Added Packer install script and validate script to provisioners.

* Add Packer install script and validation script

Add Packer install and validation script to provisioners.

images/linux/scripts/installers/packer.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+################################################################################
+##  File:  packer.sh
+##  Desc:  Installs packer
+################################################################################
+# Source the helpers for use with the script
+source $HELPER_SCRIPTS/document.sh
+source $HELPER_SCRIPTS/apt.sh
+
+# Install Packer
+PACKER_VERSION=$(curl -s https://checkpoint-api.hashicorp.com/v1/check/packer | jq -r .current_version)
+curl -LO "https://releases.hashicorp.com/packer/${PACKER_VERSION}/packer_${PACKER_VERSION}_linux_amd64.zip"
+unzip "packer_${PACKER_VERSION}_linux_amd64.zip" -d /usr/local/bin
+rm -f "packer_${PACKER_VERSION}_linux_amd64.zip"
+
+# 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 packer; then
+    echo "Packer was not installed or found on PATH"
+    exit 1
+fi
+
+# Document what was added to the image
+echo "Lastly, documenting what we added to the metadata file"
+DocumentInstalledItem "Packer ($(packer --version))"