Processing Linux 32-bit instructions

.github/ARM32.md

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+# Processing 32-bit Linux
+
+For the Raspberry Pi 3 and older we'd need to create an 32-bit arm version of
+processing.
+
+Github Actions do not support creating 32 bit runners so we need to host one
+ourselves.
+
+## Instructions
+
+Use [Raspberry Pi Imager](https://www.raspberrypi.com/software/) to download
+Raspberry PI OS lite (32bit) to an SD card
+
+Use the settings to set up a proper hostname and user account.
+
+Take the written SD card and put it into the Raspberry PI
+
+Power it up and wait for it to boot
+
+SSH into the Raspberry PI
+
+Follow Githubs instructions on how to set up a self-hosted runner
+https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners/adding-self-hosted-runners
+
+Use all the default values in the `./config.sh` setup step
+
+Use Github instructions to setup the runner as a services so it runs on boot
+https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners/configuring-the-self-hosted-runner-application-as-a-service
+
+Done.