Be able to use SSH Keys with passphrase

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#### Description
Hi, I have done some research and is a little surprised that i can not use a private SSH_Key with passphrace when building an image? I only get the "This key is protected by passphrace" error. Without any passphrace it works fine.

When running the build, i should ether be prompted to type the password or have the option to get it from the vault with an variable.

#### Use Case(s)
Build images with secure ssh keys with passphraces.

#### Potential configuration

#### Potential References