Improve error message for missing variables in ${VAR?err} syntax
#1371
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When using Bash-style variable substitution with error enforcement (e.g.,
${MY_VAR?Variable not set}),podman-composeraises aRuntimeErrorif the variable is missing.Currently, this error only contains the custom error text provided in the string (e.g.,
"Variable not set"). It does not indicate which variable triggered the error. In largedocker-compose.ymlfiles with many required variables, this makes debugging impossible without modifying the source code.This PR updates the
RuntimeErrorto prepend the variable name to the error message.RuntimeError: Variable not setRuntimeError: Variable 'OPENSEARCH_ADMIN_PASSWORD': Variable not set