diff --git a/.github/workflows/interop.yml b/.github/workflows/interop.yml
index 57f37336..f1c318e2 100644
--- a/.github/workflows/interop.yml
+++ b/.github/workflows/interop.yml
@@ -10,9 +10,6 @@ jobs:
     permissions:
       id-token: write
       contents: read
-    env:
-      BUCKET: "quic-interop-runner"
-      RETENTION_DAYS: "3"
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
@@ -24,10 +21,10 @@ jobs:
         env:
           B2_APPLICATION_KEY_ID: ${{ secrets.BACKBLAZE_KEY_ID }}
           B2_APPLICATION_KEY: ${{ secrets.BACKBLAZE_APPLICATION_KEY }}
-      - name: upload a file
+      - name: remove old logs
         run: |
-          threshold_time=$((($(date +%s) * 1000) - (${{ env.RETENTION_DAYS }} * 24 * 60 * 60 * 1000)))
-          old_files=$(b2 ls --json ${{ env.BUCKET}} | jq -r ".[] | select(.uploadTimestamp > $threshold_time)")
+          threshold_time=$((($(date +%s) * 1000) - (${{ vars.LOG_RETENTION_DAYS }} * 24 * 60 * 60 * 1000)))
+          old_files=$(b2 ls --json ${{ vars.BACKBLAZE_BUCKET}} | jq -r ".[] | select(.uploadTimestamp < $threshold_time)")
           echo "Deleting files:"
           echo $old_files | jq ".fileName"
           # Now delete them
@@ -36,7 +33,12 @@ jobs:
             echo "Deleting $dir_name"
             # see https://github.com/Backblaze/B2_Command_Line_Tool/issues/495#issuecomment-413932585
             mkdir empty # create an empty directory
-            b2 sync --delete --allowEmptySource empty b2://${{ env.BUCKET }}/"$dir_name"
+            b2 sync --delete --allowEmptySource empty b2://${{ vars.BACKBLAZE_BUCKET }}/"$dir_name"
             rmdir empty
           done
+      - name: generate logs.json and upload it
+        run: |
+          b2 ls --json quic-interop-runner | jq '[sort_by(.uploadTimestamp) | .[] | select(.fileName | contains("/")) | .fileName | split("/")[0] | select(. != null)]' > logs.json
+          b2 sync ./logs.json b2://${{ vars.BACKBLAZE_BUCKET }}
+