The easiest way to do that is to inject the contents of the file in the custom bash script section, which runs inside the instance when it starts. Something in the form of echo "<contents>" > <path-to-file>

Thanks, I got that issue resolved

Hi @<1610083503607648256:profile|DiminutiveToad80> , what kind of file are you looking to add into the container?

So, one of my tasks requires GCP credentials json file, is there a way that I can pass in the json file and set the environment variable for that?