Private function that adds a package to the list of dependencies that will be installed on the Promote server
| 1 2 | add.dependency(name, importName, src, version, install, auth_token, ref,
  subdir)
 | 
| name | name of the package to be installed | 
| importName | name under which the package is imported (for a github package, this may be different from the name used to install it) | 
| src | source that the package is installed from (CRAN or github) | 
| version | version of the package | 
| install | whether or not the package should be installed in the model image | 
| auth_token | a personal access token for github or gitlab repositories | 
| ref | The git branch, tag, or SHA of the package to be installed | 
| subdir | The path to the repo subdirectory holding the package to be installed | 
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