Use explicit beta image tag for Docker Scout scan and Jira payload

[Copilot]

This addresses the review comment on PR #797: docker/metadata-action emits steps.meta.outputs.tags as a multiline string, so indexing ([0]) is not a reliable image reference. The workflow now uses an explicit versioned tag derived from env.VERSION for both scan input and Jira ticket payload.

• Workflow fix (build_publish_image_autoinstrumentation_beta.yaml)

  • Replaced steps.meta.outputs.tags[0] in Docker Scout image with:
    • ${{ github.repository_owner }}/autoinstrumentation-python:${{ env.VERSION }}-beta
  • Replaced steps.meta.outputs.tags[0] in Jira action image-tag with the same explicit tag.

• Resulting behavior

  • Scout scan target and Jira metadata now resolve to the same deterministic, valid tag format, independent of metadata-action output shape.

with:
  command: cves
  image: ${{ github.repository_owner }}/autoinstrumentation-python:${{ env.VERSION }}-beta
...
with:
  image-tag: ${{ github.repository_owner }}/autoinstrumentation-python:${{ env.VERSION }}-beta