feat: use download-artifact instead of manually downloading it

This should hopefully work on private repos too!

action.yml

@@ -142,7 +142,7 @@ runs:
             --arg head_branch "${BASE_BRANCH:-$(default_branch)}" \
             '[.workflow_runs[] | select(.name == $name and .head_branch == $head_branch)] | first | .run_number')
 
-        echo "run-id=${{ github.run_id }}" >> "$GITHUB_OUTPUT"
+        echo "run-id=$run_id" >> "$GITHUB_OUTPUT"
         log Would try to download "$ARTIFACT_NAME" from "$run_id"
     - name: Download previous report
       uses: https://git.salame.cl/actions/download-artifact@d8d0a99033603453ad2255e58720b460a0555e1e # v4
@@ -151,7 +151,7 @@ runs:
       with:
         name: ${{ inputs.artifact-name }}
         github-token: ${{ inputs.github-token }}
-        run-id: ${{ steps.previous-report.outputs.run-id }}
+        # run-id: ${{ steps.previous-report.outputs.run-id }}
     - name: Create report
       if: inputs.comment-on-pr == 'true' || inputs.generate-artifact == 'true'
       env: