我需要安装ssh才能运行以下命令：
git+ssh://git@github.com/some_org/some_repo#egg=some_egg
此操作失败，并出现以下错误：
Collecting athena from git+ssh://git@github.com/some_org/some_repo-py#egg=some_egg (from -r /requirements/athena.txt (line 2))
Cloning ssh://git@github.com/some_org/some_repo to /tmp/pip-build-jx3xzcel/athena
error: cannot run ssh: No such file or directory
fatal: unable to fork
Command "git clone -q ssh://git@github.com/some_org/some_repo /tmp/pip-build-jx3xzcel/athena" failed with error code 128 in None
You are using pip version 9.0.3, however version 19.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
The command '/bin/sh -c pip3 install -r /requirements/athena.txt' returned a non-zero code: 1
Makefile:109: recipe for target 'build' failed
似乎我没有在容器中安装ssh，因此尝试安装它。
我已经尝试过使用各种页面上的命令在Debian上安装ssh，但没有一个起作用。这些命令包括通过openssh-server
openssh-client和apt-get
RUN apt-get install -yqq openssh-server
我希望已安装ssh，并且dockerfile中的这一步骤可以成功完成，但是却出现以下错误：
Step 20/38 : RUN apt-get install openssh-server
---> Running in e63d8d044b88
Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package openssh-server
The command '/bin/sh -c apt-get install openssh-server' returned a non-zero code: 100
make: *** [dev] Error 100