Create / Rotate SSH Key

Create a new SSH key (set strong Password)
```
ssh-keygen -t ed25519 -C "user@host"
```
by default it's stored in ~/.ssh/id_ed25519 (private key) and ~/.ssh/id_ed25519.pub (public key)
add your public key (not Private !) where you need it, e.g. the following places and remove old ones:
1. https://github.com/settings/keys
2. https://gitlab.com/profile/keys

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