A template is a special GitHub repo that you can copy into your account. This template will deploy your Shiny app when you commit a change to GitHub. You're going to add 3 secrets. Name: SHINY_ACCOUNT ...
However, if using the 0.2.3 CRAN version everything works just fine with shinyapps.io when deployed, so this is something to do specifically with the 0.2.4 version released here and not missing ...