Build the image from rocker/r-ver directly. I don't think I need the RStudio bundle in the docker image and I need a smaller image for CI.
Fix the pandoc installing issue.I bet I will encounter issues in the end because pandoc will not be installed if the image built from rocker/r-ver instead of rocker/rstudio
Add the rdocker4shiny
Add the mssqlserver odbc driver and ensure it works
Add the oracle db driver
Add more latex packages especially those relate to CTEX.