fix: retrieve to stdout failure

[dtbuchholz]

Summary

Fixes a bug where vaults retrieve -o - ... fails.

Details

The retrieve command with -o - should write to stdout. However, this was not working due to a small operator typo in which the tmpFile variable was not being assigned a value, so the write to stdout wasn't executing because tmpFile was seen as nil. This was due to the usage of := over = within a conditional block scope.

How it was tested

Build & then run vaults retrieve --output - bafybeigpvzdvjgde5a6ayj7265a6ns3i4mvhhr6pqtlebpil5imkeh4ncy | car extract to pipe the output to car extract, which unpacks the car file from stdout successfully.

[dtbuchholz]

@brunocalza not sure how i missed this...it was originally working when i wrote that code, but i must've accidentally changed the assignment operator before this got merged. just double checking—do we have tests set up? if so, i could make sure there's one for this command flag. (i'm not as familiar with go so didn't want to mess with anything.)

[brunocalza]

@brunocalza not sure how i missed this...it was originally working when i wrote that code, but i must've accidentally changed the assignment operator before this got merged. just double checking—do we have tests set up? if so, i could make sure there's one for this command flag. (i'm not as familiar with go so didn't want to mess with anything.)

This repo is lacking in tests, because it's hard to implement tests for CLI :( but we can think of a way for sure, just didn't want to spend too much time on that since the directions of the project wasn't clear