do not aggregate on no cache found

.github/actions/aggregate-worker/action.yaml

@@ -11,6 +11,10 @@ inputs:
 runs:
   using: "composite"
   steps:
+    - name: Ensure folders exist
+      run: |
+        mkdir -p ${{ env.AGG }}
+        mkdir -p ${{ env.REPO }}
     - name: Fetch results of ${{ inputs.worker }}
       id: restore
       uses: actions/cache/restore@v4
@@ -21,7 +25,8 @@ runs:
           apt-repo-${{ inputs.stage }}-${{ inputs.worker }}-${{ github.sha }}-${{ github.run_id }}
     - name: Aggregate files
       shell: bash
-      if: ${{ steps.restore.outputs.cache-hit != '' }}
+      # if ANY cache was found (i.e., the one from this attempt or a previous one)
+      if: steps.restore.outputs.cache-hit == 'true' || steps.restore.outputs.cache-hit == 'false'
       run: |
         cat ${{ env.REPO }}/pkg_build_status.csv >> ${{ env.AGG }}/pkg_build_status.csv
         cat ${{ env.REPO }}/sources.repos |