Adding self installation command for fabrica

.packer/script/install

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+#set -eo pipefail
+set -o pipefail
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" > /dev/null && pwd )"
+
+sparsify=$(which virt-sparsify)
+if [ $? -ne 0 ]
+then
+    echo "!!!"
+    echo "!!! Warning : virt-sparsify is not present, you may encounter build issues with cadoles recipes !"
+    echo "!!!           Please install libguestfs if you want to build cadoles production images"
+    echo "!!!"
+fi
+
+# Install a local copy of packer
+PACKER_VERSION=1.6.6
+PACKER_ARCH=amd64
+#PACKER_ARCHIVE_SHA256SUM=30da8dab9c526a6d15b037e2234f6f12cf3accfad77eb2c130738ec1a54cab6d
+#PACKER_ARCHIVE_SHA256SUM=a678c995cb8dc232db3353881723793da5acc15857a807d96c52e96e671309d9
+PACKER_ARCHIVE_SHA256SUM=721d119fd70e38d6f2b4ccd8a39daf6b4d36bf5f7640036acafcaaa967b00c3b
+
+wget -O- https://releases.hashicorp.com/packer/${PACKER_VERSION}/packer_${PACKER_VERSION}_linux_${PACKER_ARCH}.zip > packer.zip
+echo "${PACKER_ARCHIVE_SHA256SUM} packer.zip" | sha256sum -c
+
+mkdir -p "${DIR}/../.bin"
+unzip -o -d "${DIR}/../.bin" packer.zip
+rm -f packer.zip
+
+# Cadoles Packer plugins
+
+# OpenNebula - Post-Processor Image Template
+PLUGIN_ARCHIVE=https://forge.cadoles.com/Cadoles/packer-opennebula/releases/download/4fa5cbc782/packer-post-processor-opennebula-image-template-rev.4fa5cbc-linux-amd64.tar.gz
+wget -O- "$PLUGIN_ARCHIVE" > plugin.tar.gz
+tar -C "$DIR/../.bin" --strip=1 --wildcards -xzf plugin.tar.gz --wildcards packer-*/packer-post-processor-opennebula-image-template
+rm -f plugin.tar.gz