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This commit improves the code quality of twsl's ARG parsing fix by extracting the duplicated logic into a reusable helper function. Changes: - Add buildArgsWithDefaults() helper that merges external build args with ARG defaults from a Dockerfile, respecting precedence rules - Refactor UserFromDockerfile() to use the new helper - Refactor ImageFromDockerfile() to use the new helper and simplify the FROM instruction finding logic - Remove debug fmt.Println statements from tests The original fix (PR coder#463) correctly addressed issue coder#455 where build args from devcontainer.json were not being used when resolving image references in Dockerfiles with ARG variables. This refactoring reduces code duplication while preserving the fix's behavior. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Refactor: Extract helper function to reduce code duplication
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I don't have any go skills whatsoever, but here is my attempt to fix #455