Fix: SharePoint upload fails — ISO at /mnt not accessible to Docker action container

[Copilot]

The Send ISO to Sharepoint step was failing with [Error] No files matched pattern: /mnt/<iso-file> because amentumcms/sharepoint-file-upload-action@main is a Docker-based action launched by the host runner — it only has $GITHUB_WORKSPACE mounted, not /mnt. The job runs inside a UBI container with /mnt:/mnt volume, so the ISO exists on the host at /mnt/... but is invisible to the action container.

Changes

• collect-branch.yml: Added a cp step before Send ISO to Sharepoint to stage the ISO into ${{ github.workspace }}, which is mounted in all Docker action containers. Updated file_path to reference ${{ github.workspace }} instead of ${{ env.WORKDIR }}. Added max_retries: 3.

- name: Copy ISO to workspace for SharePoint upload
  run: |
    cp ${{ env.WORKDIR }}/${{ env.REPO }}-${{ matrix.os }}-${{ needs.Date.outputs.Date }}.iso \
       ${{ github.workspace }}/

- name: Send ISO to Sharepoint
  uses: amentumcms/sharepoint-file-upload-action@main
  with:
    file_path: "${{ github.workspace }}/${{ env.REPO }}-${{ matrix.os }}-${{ needs.Date.outputs.Date }}.iso"
    ...
    max_retries: 3