update README

Author: spamegg1

.github/workflows/workflow.yml

@@ -1,5 +1,5 @@
 name: Build LaTeX document
-on: [push]
+on: [push, pull_request]
 permissions:
   contents: write
 

README.md

@@ -23,7 +23,17 @@ Contact me: `spamegg1` on Discord, or [on Slack](https://join.slack.com/t/spameg
 ## Contributing
 
 Only edit the `Epp.tex` source file, I use Github Actions to compile and release the PDF file automatically.
+
 So, you do not have to include your compiled PDF in your pull requests.
 
+### Compiling locally
+
+You don't need to do this for contributing, Github actions will take care of it for you on pull requests.
+
+But if you are compiling locally, you'll need:
+
+- a full [TeXlive](https://www.tug.org/texlive/) installation (you do need the *full* thing, I use some rare / obscure packages), and
+- since I am using [minted](https://github.com/gpoore/minted) for syntax highlighting some code, you'll have to pass the [`-shell-escape` argument](https://tex.stackexchange.com/questions/598818/how-can-i-enable-shell-escape#598819) to `latexmk` for the compilation.
+
 [cc-by-nc-sa]: http://creativecommons.org/licenses/by-nc-sa/4.0/
 [cc-by-nc-sa-shield]: https://img.shields.io/badge/License-CC%20BY--NC--SA%204.0-lightgrey.svg