'How to permanently save SSH Key passphrase in Gitkraken?

I'm using Gitkraken and it keeps forgetting my SSH Key passphrase after every restart of the app. I've tried ssh-add with the Gitkraken CLI/Terminal, but I haven't been able to figure out how to make Gitkraken remember the SSH Key passphrase in between restarts. Can somebody educate me how to do this?

Enter passphrase for SSH key prompt



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