genJqSecretsReplacementSnippet: Propagate secret file read errors
genJqSecretsReplacementSnippet: Propagate secret file read errors

If an error occurs while trying to read a secret file, we want that
error to propagate to the main shell context. That means we have to
set the `inherit_errexit` option, which allows errors from subshells
to propagate to the outer shell. Also, the subshell cannot run as part
of another command, such as `export`, since that will simply ignore
the subshell exit status and only respect `export`s exit status; first
assigning the value to a variable and then exporting it solves issue.

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