Fix workflow build failure by replacing non-existent GitHub action

[Copilot]

Problem

The workflow was failing on every run with the error:

##[error]Unable to resolve action oleg-chudnovskiy/docker-pull-remote-image-digest, repository not found

This was caused by using a third-party GitHub action oleg-chudnovskiy/docker-pull-remote-image-digest@v1 that doesn't exist or has been removed.

Solution

Replaced the non-existent action with a simple shell script that uses Docker's built-in docker manifest inspect command to fetch the remote image digest:

- name: Get digest of the remote 'latest' image
  if: github.event_name != 'push'
  id: remote_digest
  run: |
    # Try to get the digest of the remote image, handle case when it doesn't exist
    DIGEST=$(docker manifest inspect ghcr.io/${{ github.repository }}:latest 2>/dev/null | jq -r '.config.digest' || echo "")
    echo "digest=$DIGEST" >> $GITHUB_OUTPUT
    echo "Remote digest: $DIGEST"

This approach:

• Uses standard Docker CLI tools available in GitHub Actions runners
• Handles errors gracefully when the image doesn't exist yet (first run)
• Maintains the same workflow logic and outputs
• Eliminates the dependency on unmaintained third-party actions

Testing

• ✅ YAML syntax validated
• ✅ Workflow file parses correctly
• ✅ Minimal changes (only modified the failing step)

Fixes https://github.com/GordonBeeming/copilot_here/actions/runs/18219132128

Original prompt

help me fix my build please

https://github.com/GordonBeeming/copilot_here/actions/runs/18219132128

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[Copilot]

Pull Request Overview

This PR fixes a GitHub Actions workflow failure by replacing a non-existent third-party action with a native shell script solution. The workflow was failing because it referenced oleg-chudnovskiy/docker-pull-remote-image-digest@v1, which doesn't exist or has been removed.

• Removes dependency on non-existent third-party GitHub action
• Implements equivalent functionality using Docker CLI and jq
• Maintains same workflow outputs and error handling

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