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KWallet
KWallet is the password manager for KDE. It is the counterpart of GNOME Keyring but the wallets are not compatible.
Store SSH key passphrases
To avoid unlocking the key for every git action you can instead store the credentials in the wallet and unlock only once per boot.

Start Software. Search for package "ksshaskpass5". Click the ideal package to open detail page. Click Install button.

Start Discover. Search for package "ksshaskpass5". Click the ideal package to open detail page. Click Install button.

Start YaST --> Software Management. Search for package "ksshaskpass5". Check the checkbox for installation (green check). Click Accept button to start installation.

Create an autostart script file and mark it as executable:
~/.config/autostart-scripts/ssh-add.sh
#!/bin/sh
ssh-add -q < /dev/null
Create the following autostart script file and mark it executable:
~/.config/plasma-workspace/env/askpass.sh
#!/bin/sh
export SSH_ASKPASS='/usr/lib/ssh/ksshaskpass'
To add a new key and store the password with KWallet use the following command:
ssh-add