terraform/install: deal with symlinks better

Author: Enzime

terraform/install/run-nixos-anywhere.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd)"
+SCRIPT_DIR="$(realpath "$(dirname "${BASH_SOURCE[0]}")")"
 args=()
 
 if [[ ${debug_logging-} == "true" ]]; then