maintainers/create-azure.sh: run from anywhere

I'm not really sure how the line directly after ended up with this,
but this line didn't...

Changed files
+2 -2
nixos
maintainers
scripts
+2 -2
nixos/maintainers/scripts/azure/create-azure.sh
···
-
#! /bin/sh -e
+
#! /bin/sh -eu
-
export NIX_PATH=nixpkgs=../../../..
+
export NIX_PATH=nixpkgs=$(dirname $(readlink -f $0))/../../../..
export NIXOS_CONFIG=$(dirname $(readlink -f $0))/../../../modules/virtualisation/azure-image.nix
export TIMESTAMP=$(date +%Y%m%d%H%M)