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I'm trying to use the solution given by the accepted answer in

How to have \psframe working with LuaLatex?

but I don't know how to enable the option --shell-escape there.

Overleaf explains that it has a configuration file called latexmk, but I don't understand a single line of it:

https://www.overleaf.com/help/216-how-does-overleaf-compile-my-project

I'm sorry if this is considered a technical support question. If I don't find a fast answer here, I'm going to contact Overleaf, but maybe this question helps somebody else here someday.

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    The --shell-escape option allows the end user to possibly execute external applications that could be harmful. I doubt server-applications like Overleaf would allow for this. The latexmk approach merely compiles your file until all references/links are fully resolved. One way to check whether they support --shell-escape would be to create a small minted example. – Werner Feb 5 '16 at 18:07
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    I'd be amazed if any public server hosted latex system allows --shell-escape. – David Carlisle Feb 5 '16 at 18:31
  • I just compiled the "Hello World" example there: overleaf.com/read/hcywbbsfmnmc . Does that mean that --shell-escape is enabled? – Leonardo Castro Feb 5 '16 at 18:51
  • @DavidCarlisle If they allow LuaTeX, aren't they essentially doing so anyway? – cfr Feb 6 '16 at 0:02
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    As the blog post in @Benjamin's answer says, latexmkrc and --shell-escape are allowed on Overleaf. Each Overleaf project is a Docker container (digital-science.com/blog/tech/…), so each project's settings and tricks stays within its own container. – imnothere Feb 6 '16 at 7:48
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According to this blog post, it should be possible to upload a latexmkrc file to your project and surprisingly even shell-escape seems to be allowed. I haven't tested it, but something like this should work:

$pdflatex = 'lualatex %O %S --shell-escape';
$pdf_mode = 1;
$postscript_mode = $dvi_mode = 0;
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