Suggestion by:
https://github.com/hashicorp/packer-plugin-ansible/issues/69#issuecomment-1046965236

Latest versions of packer removed ssh-rsa keys from accepted methods of
publickey auth. This commit is a workaround to allow ssh-rsa to be used
for ssh by packer communicator to ssh into build instance.
This should be fixed in the upcoming iterations to use correct methods
like ssh-ecdsa etc.