feat: use download-artifact instead of manually downloading it

This should hopefully work on private repos too!

.forgejo/workflows/check.yml

@@ -48,9 +48,10 @@ jobs:
     steps:
       - name: Download previous report
         uses: https://git.salame.cl/actions/download-artifact@d8d0a99033603453ad2255e58720b460a0555e1e # v4
-        # Ensure the previous step succeeded
-        # if: steps.previous-report.outcome == 'success'
         with:
-          name: ${{ inputs.artifact-name }}
+          name: report.json
-          # github-token: ${{ inputs.github-token }}
+          github-token: ${{ github.token }}
-          # run-id: ${{ steps.previous-report.outputs.run-id }}
+          run-id: 15
+      - name: Verify report exists
+        run: |
+          cat report.json