As you can check the file config.production.json has the permissions -rw-r----- 1 bitnami daemon. This means that you can only edit that file when connecting to your server via SSH using the user bitnami.
I guess you're using the SSH terminal that Google offers you to connect to your sever through the browser. Once you're connected, could you run the command:
sudo su bitnami
That would make you become the user bitnami and you should be able to see the content of the file and edit it.
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