I'm sorry I messed this PR up.
I am trying to build arduino-ide using a raspberry pi as a self-hosted runner.

I think you will need to run the workflow in your own repository in order for it to be able to access your self-hosted runner.

Unfortunately, the build workflow was unnecessarily configured so that it does not run at all in forks. However, it is simple to adjust by removing this line:

There are some repository secrets which are required in order to produced signed macOS and Windows builds, but if you only need the Linux build then you could just remove those jobs from the matrix:

Or set this to true if you do want the unsigned builds for those OSes:

OK. This works.

• in github, fork arduino/arduino-ide
• patch your fork with file self_hosted_runner.patch
• configure a new self-hosted runner:
  In "Settings -> Actions -> Runners -> New Self-hosted Runner", choose:
  • Runner image: Linux
  • Architecture: ARM64
• Follow instructions to create a self-hosted runner, from "Create a folder" to "Last step, run it!".
• In "Actions" choose "Arduino IDE" and click "Run workflow"

On the runner:

$ ./run.sh
√ Connected to GitHub
Current runner version: '2.290.1'
2022年04月25日 07:59:29Z: Listening for Jobs
2022年04月25日 08:24:16Z: Running job: build
[sudo] password for koen: 
2022年04月25日 09:02:18Z: Job build completed with result: Succeeded

Build time is 38 minutes on a raspberry pi 4b, 8gb ram, running off a Samsung T5 external SSD disk.
self_hosted_runner.patch.txt

Add to upload appimage and zip as artifacts.
artifacts.patch.txt