libgit2_config() reveals which version of libgit2 gert is using and which
features are supported, such whether you are able to use ssh remotes.
Examples
libgit2_config()
#> $version
#> [1] ‘1.7.2’
#>
#> $ssh
#> [1] TRUE
#>
#> $https
#> [1] TRUE
#>
#> $threads
#> [1] TRUE
#>
#> $https.backend
#> [1] NA
#>
#> $ssh.backend
#> [1] NA
#>
#> $config.global
#> [1] "/github/home/.gitconfig"
#>
#> $config.system
#> [1] ""
#>
#> $config.home
#> [1] "/github/home"
#>
