The authenticity of host '10.0.10.29 (10.0.10.29)' can't be established.
ECDSA key fingerprint is SHA256:vXhdvud24tyTUtOan4XeTZ7GzxZDQn9Rj0mxuhimkH4.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '10.0.10.29' (ECDSA) to the list of known hosts.
pi@10.0.10.29's password: 
Current password: raspberry
New password: gECzebzn7GYSLvXueECAxeGm7l7
Retype new password: gECzebzn7GYSLvXueECAxeGm7l7
passwd: password updated successfully
Changing password for pi.
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/django/.ssh/id_ed25519_freifunk.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
pi@10.0.10.29's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh -o 'IdentitiesOnly=yes' 'pi@raspberry-ansible'"
and check to make sure that only the key(s) you wanted were added.