Herokuにアカウントを作った後に、以下を試してみた。
C:\Users\name-string>heroku login Enter your Heroku credentials. Email: <Herokuに登録したメールアドレス> Password: <Herokuアカウントのパスワード> Authentication successful. C:\Users\name-string>heroku keys:add Found existing public key: C:/Users/name-string/.ssh/id_rsa.pub Uploading ssh public key C:/Users/name-string/.ssh/id_rsa.pub C:\Users\name-string>git clone git@heroku.com:<app name>.git Cloning into <app name>... Enter passphrase for key '/c/Users/name-string/.ssh/id_rsa': remote: Counting objects: 139, done. remote: Compressing objects: 100% (72/72), done. remote: Total 139 (delta 64), reused 135 (delta 62) Receiving objects: 100% (139/139), 73.38 KiB | 77 KiB/s, done. Resolving deltas: 100% (64/64), done. C:\Users\name-string>
とりあえず動いているっぽい。