docs(env): Document our environment variables

Author: Madman10K

docs/experimental-documentation/Advanced/EnvironmentVariables.md

@@ -0,0 +1,19 @@
+CodeTracer exposes a number of environment variables that you can use to override some of its behaviours:
+
+1. `CODETRACER_ELECTRON_ARGS` - adds arguments for launching Electron. Useful for debugging production builds
+1. `CODETRACER_WRAPPER_PID` - overrides the process ID of the `ct` CodeTracer wrapper
+1. `CODETRACER_CALLTRACE_MODE` - changes the calltrace mode
+1. `CODETRACER_RECORD_CORE` - this does nothing as it is only related to the unreleased system backend
+
+## CodeTracer Shell
+These are generally not functional right now, since they affect CodeTracer Shell, which is currently not implemented:
+
+1. `CODETRACER_SHELL_BASH_LOG_FILE` - overrides the log file
+1. `CODETRACER_SHELL_ID` - overrides the shell ID
+1. `CODETRACER_SESSION_ID` - overrides the CodeTracer Shell session ID so that the current commands affect a previous shell session
+1. `CODETRACER_SHELL_REPORT_FILE` - overrides the report file of CodeTracer Shell
+1. `CODETRACER_SHELL_USE_SCRIPT` - ?
+1. `CODETRACER_SHELL_RECORDS_OUTPUT` - ?
+1. `CODETRACER_SHELL_EXPORT` - ?
+1. `CODETRACER_SHELL_CLEANUP_OUTPUT_FOLDER` - ?
+1. `CODETRACER_SHELL_SOCKET` and `CODETRACER_SHELL_ADDRESS` - they override the socket location and address respectively

docs/experimental-documentation/_Sidebar.md

@@ -26,6 +26,7 @@
   - Limitations
   - [Troubleshooting](https://dev-docs.codetracer.com/Introduction/Troubleshooting)
 - Advanced topics
+  - [Environment variables](https://dev-docs.codetracer.com/Advanced/EnvironmentVariables)
   - Custom patches
   - Dotfiles
 - Misc