Unable to connect to bitbucket via ssh using docker-compose

Question

docker-compose file:

ARG SSH_PRIVATE_KEY
RUN mkdir ~/.ssh/
RUN echo "${SSH_PRIVATE_KEY}" > ~/.ssh/id_rsa
RUN chmod 600 ~/.ssh/id_rsa
RUN ssh-keyscan bitbucket.org >> ~/.ssh/known_hosts

getting:

git@bitbucket.org: Permission denied (publickey).

when reaching the yarn install command

Aron Greenspan_lu51b1 · Accepted Answer

It was because the ssh key i'd used had been created with a passphrase. I made a new one without and it worked without issue.