[ci] Fix missing git install in R artifact job (fixes #3567) (#3587)
[ci] Fix missing git install in R artifact job (fixes #3567) (#3587)


microsoft/LightGBM,henry0312/LightGBM,microsoft/LightGBM,microsoft/LightGBM,microsoft/LightGBM,microsoft/LightGBM,henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM