使用Git(Bitbucket)拒绝Dockerfile公钥权限

虽然我已经搜索了多个SO QnAs,但是在使用Dockerfile来保存包含私有repo依赖项的Node.js应用程序时,我无法完全解决我的问题.这是我的Dockerfile的相关部分:

FROM node:8.7.0-alpine

RUN \
    # install required packages
    apk --no-cache add --virtual \
    builds-deps \
    build-base \
    python \
    git \
    openssh-client

# git config
RUN git config --global user.name "*****"
RUN git config --global user.email "*****@*****.co"

# *******************
# install git ssh key
# *******************
# create ssh dir
RUN mkdir /root/.ssh

# Copy over private key from volume and set permissions
ADD bitbucket_rsa /root/.ssh/bitbucket_rsa
RUN chmod 600 /root/.ssh/bitbucket_rsa
# start agent
RUN eval $(ssh-agent)
# load key into agent
RUN echo ssh-add /root/.ssh/bitbucket_rsa
RUN echo -e "Host bitbucket.org\n\tStrictHostKeyChecking no\n" >> /root/.ssh/config

...

以下是NPM抛出的内容:

npm ERR! Error while executing:
npm ERR! /usr/bin/git ls-remote -h -t ssh://git@bitbucket.org/someteamname/somereponame.git
npm ERR!
npm ERR! Warning: Permanently added 'bitbucket.org,XXX.XXX.XXX.XXX' (RSA) to the list of known hosts.
npm ERR! Permission denied (publickey).
npm ERR! fatal: Could not read from remote repository.
npm ERR!
npm ERR! Please make sure you have the correct access rights
npm ERR! and the repository exists.
npm ERR!
npm ERR! exited with error code: 128

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2017-10-27T01_12_06_116Z-debug.log

我在这里错过了什么？提前感谢您的帮助!