diff --git a/.github/workflows/build-test-deploy.yml b/.github/workflows/build-test-deploy.yml
index 0e43d5e3c..6319a4bf4 100644
--- a/.github/workflows/build-test-deploy.yml
+++ b/.github/workflows/build-test-deploy.yml
@@ -32,10 +32,12 @@ jobs:
       
       # SSH key recipe from https://www.webfactory.de/blog/use-ssh-key-for-private-repositories-in-github-actions
       - name: Establish ssh
+        if: contains(github.ref , 'refs/tags/')
+        env:
+          SSH_AUTH_SOCK: /tmp/ssh_agent.sock
         run: |
           mkdir -p ~/.ssh
           ssh-keyscan github.com >> ~/.ssh/known_hosts
           ssh-agent -a "$SSH_AUTH_SOCK" > /dev/null
           ssh-add - <<< "${{ secrets.ID_GCTUPLOADER }}"
-        env:
-          SSH_AUTH_SOCK: /tmp/ssh_agent.sock
+          travis-ci/upload_source_tarballs.sh ${{ github.repository_owner }}