Remove modify-apt-sources.sh

[int128]

We decided to mount /etc/apt/sources.list in an AutoscalingRunnerSet as follows:

apiVersion: actions.github.com/v1alpha1
kind: AutoscalingRunnerSet
metadata:
  name: any-amd64
spec:
  template:
    spec:
      containers:
        - name: runner
          volumeMounts:
            # Use cloud-local APT sources to reduce the time of apt-get.
            # You need to set subPath to the current version of Ubuntu.
            - name: apt-sources
              subPath: apt-sources-jammy-amd64.list
              mountPath: /etc/apt/sources.list
      volumes:
        - name: apt-sources
          configMap:
            name: apt-sources

This pull request will remove the entrypoint script.

[github-actions]

🆕 If you need to build a new runner image, create a new release after merge.

[github-actions]

🆕 If you need to build a new runner image, create a new release after merge.