BUG: Not able to build images (SCION - setup tutorial)

[msampathkumar]

Description

As mentioned in https://googlecloudplatform.github.io/scion/advanced-local/custom-images/#option-2-local-podman-build, ran commands to build local images.

image-build/scripts/build-images.sh: line 272: build_arg_flags[@]: unbound variable

Steps to Reproduce

Clone the repo, build SCION from it. Run below command from the same local copy

1. scion init
2. image-build/scripts/build-images.sh --builder local-podman --target all

Expected Behavior

NA

Actual Behavior

$ image-build/scripts/build-images.sh
   --builder local-podman --target all
   Builder:  local-podman  (mode: per-image)
   Target:   all
   Registry: <none — bare local tags>
   Tag:      latest (+ :9d39XXXXX)
   Platforms: <native>
   Push:     false
   Steps:    core-base scion-base scion-claude scion-gemini
   scion-opencode scion-codex scion-hub

   image-build/scripts/build-images.sh: line 272: build_arg_flags[@]:
   unbound variable

Debug Output

NA

Environment

• Scion version: Commit: 9d39b30 Build Time: 2026-05-14T17:24:13Z
• OS/Platform: Mac
• Runtime: Podman
• Harness: Gemini