Add automated build script

build.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+PACKER=$(which packer)
+
+if [ "x${PACKER}" == "x" ]; then
+    echo "Packer not found; downloading v1.5.4 from Hashicorp"
+    wget https://releases.hashicorp.com/packer/1.5.4/packer_1.5.4_linux_amd64.zip
+    unzip packer_1.5.4_linux_amd64.zip
+    rm packer_1.5.4_linux_amd64.zip
+    PACKER="./packer"
+fi
+
+echo "--- Using Packer version $(${PACKER} --version)"
+
+echo "--- Building base image"
+
+${PACKER} build base_vm.json
+
+echo "--- Building extended image"
+
+${PACKER} build ros_ide_vm.json
+
+echo "--- All done!"