Note that I needed to do this build from a cloud shell, so clone and then:
git clone https://github.com/converged-computing/flux-tutorials
cd flux-tutorials/tutorial/azure/build
And install packer
wget https://releases.hashicorp.com/packer/1.11.2/packer_1.11.2_linux_amd64.zip
unzip packer_1.11.2_linux_amd64.zip
mkdir -p ./bin
mv ./packer ./bin/
export PATH=$(pwd)/bin:$PATH
Get your account information for azure as follows:
az account show
And export variables in the following format. Note that the resource group needs to actually exist - I created mine in the console UI.
export AZURE_SUBSCRIPTION_ID=xxxxxxxxx
export AZURE_TENANT_ID=xxxxxxxxxxx
export AZURE_RESOURCE_GROUP_NAME=packer-testing
Then build!
make