Create Dependabot security update Fails - proxy | exec /bin/sh: exec format error

[michaelg-baringa]

I have setup a self hosted github runner on an AWS EC2 instance (Amazon Linux 2023) ARM64 which runs the hello world workflow fine. I have then enabled Dependabot Alerts on a test repo (Enabled Dependabot on self-hosted runners as well) and copied across the javascript folder from the Demo repo (https://github.com/dependabot/demo).

In my test repo I can then see 5 Vulnerability alerts and when I click Create Dependabot security update, it starts a workflow on the self hosted runner but errors out (see output below).

Run github/dependabot-action@main
  env:
    GITHUB_TOKEN: ***
    GITHUB_DEPENDABOT_JOB_TOKEN: ***
    GITHUB_DEPENDABOT_CRED_TOKEN: ***
🤖 ~ starting update ~
Fetching job details
Pulling updater images
  Pulling image ghcr.io/dependabot/dependabot-updater-npm:cf181fa1dc5aac32f954b4919607f73957acb1b6...
  Pulled image ghcr.io/dependabot/dependabot-updater-npm:cf181fa1dc5aac32f954b4919607f73957acb1b6
  Pulling image ghcr.io/github/dependabot-update-job-proxy/dependabot-update-job-proxy:v2.0.20241004183849@sha256:5e895b5edfaba72e99d0a19b43f386b18b65fc08a2d43af5aedd6360cda56842...
  Pulled image ghcr.io/github/dependabot-update-job-proxy/dependabot-update-job-proxy:v2.0.20241004183849@sha256:5e895b5edfaba72e99d0a19b43f386b18b65fc08a2d43af5aedd6360cda56842
Starting update process
Created proxy container: e9f3a75228b0017ca90f0bd1c1b0de10c49d9585bc783a84e95f26517088ab49
  proxy | exec /bin/sh: exec format error
Error: Dependabot encountered an error performing the update

Error: (HTTP code 304) container already stopped -  

For more information see: ... (write access to the repository is required to view the log)
🤖 ~ finished: error reported to Dependabot ~