Update .github/workflows/regression-tests.yaml

Author: trask

.github/workflows/regression-tests.yaml

@@ -19,5 +19,5 @@ jobs:
       - name: Log into Docker.io using new token
         uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
         with:
-          username: ${{ secrets.DOCKER_USERNAME }}
+          username: ${{ vars.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_TOKEN_COLLECTOR_RELEASES }}