Add QUARTO_KNITR_RSCRIPT_ARGS to documented environment variables

Author: cderv

docs/advanced/environment-vars.qmd

@@ -15,11 +15,21 @@ quarto render
 
 You can read about other ways to set environment variables in Quarto Projects in [Environment Variables](/docs/projects/environment.qmd).
 
-| Variable        | Description |
-|-----------------|-------------|
-| `QUARTO_R`      | Explicit path to the version of `Rscript` to be used by the `knitr` engine and `quarto run *.R` command. |
-| `QUARTO_PYTHON` | Explicit path to the version of `python` to be used by the `jupyter` engine and `quarto run *.py` command. |
++------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
+| Variable                     | Description                                                                                                                                    |
++==============================+================================================================================================================================================+
+| `QUARTO_R`                   | Explicit path to the version of `Rscript` to be used by the `knitr` engine and `quarto run *.R` command.                                       |
++------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
+| `QUARTO_PYTHON`              | Explicit path to the version of `python` to be used by the `jupyter` engine and `quarto run *.py` command.                                     |
++------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
 | `QUARTO_VERSION_REQUIREMENT` | A [`semver`](https://semver.org/) string describing the Quarto version requested by the environment. If this check fails, Quarto will not run. |
++------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
+| QUARTO_KNITR_RSCRIPT_ARGS    | Comma separated list of command line argument to pass to `Rscript` started by Quarto when rendering with `knitr` engine, e.g.                  |
+|                              |                                                                                                                                                |
+|                              | ```                                                                                                                                            |
+|                              | QUARTO_KNITR_RSCRIPT_ARGS="--no-init-file,--max-connections=258"                                                                               |
+|                              | ```                                                                                                                                            |
++------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
 
 ## Variables Quarto sets
 
@@ -46,9 +56,14 @@ ENV["QUARTO_DOCUMENT_PATH"]
 ```
 :::
 
-| Variable | Description |
-|----------------|--------------------------------------------------------|
-| `QUARTO_PROJECT_ROOT` | Root of the project, or the directory of the file if not in project mode |
-| `QUARTO_DOCUMENT_PATH` | Directory of the document being rendered |
-| `QUARTO_PROFILE` | Profile used, e.g `QUARTO_PROFILE=advanced,production` for `quarto render --profile advanced,production` |
-| `QUARTO_FIG_WIDTH` and `QUARTO_FIG_HEIGHT` | Values for `fig-width` and `fig-height` as set in the document metadata |
++--------------------------------------------+----------------------------------------------------------------------------------------------------------+
+| Variable                                   | Description                                                                                              |
++============================================+==========================================================================================================+
+| `QUARTO_PROJECT_ROOT`                      | Root of the project, or the directory of the file if not in project mode                                 |
++--------------------------------------------+----------------------------------------------------------------------------------------------------------+
+| `QUARTO_DOCUMENT_PATH`                     | Directory of the document being rendered                                                                 |
++--------------------------------------------+----------------------------------------------------------------------------------------------------------+
+| `QUARTO_PROFILE`                           | Profile used, e.g `QUARTO_PROFILE=advanced,production` for `quarto render --profile advanced,production` |
++--------------------------------------------+----------------------------------------------------------------------------------------------------------+
+| `QUARTO_FIG_WIDTH` and `QUARTO_FIG_HEIGHT` | Values for `fig-width` and `fig-height` as set in the document metadata                                  |
++--------------------------------------------+----------------------------------------------------------------------------------------------------------+