build: Debug registry authentication

.drone.yml

@@ -66,12 +66,14 @@ steps:
     wget https://github.com/jqlang/jq/releases/download/jq-1.6/jq-linux64 -qO /bin/jq
     chmod +x /bin/jq
   - |
+    ls /kaniko/.docker -lash
     /bin/jq '.auths["https://index.docker.io/v1/"].auth="'"$(echo $DOCKER_USERNAME':'$DOCKER_PASSWORD | base64)"'"' --null-input > /kaniko/.docker/config.json
+    ls /kaniko/.docker -lash
   - |
     /kaniko/executor \
       --dockerfile=Dockerfile \
       --context=dir://. \
-      --destination=djpbessems/json-server:latest
+      --destination=index.docker.io/djpbessems/json-server:latest
   environment:
     DOCKER_USERNAME:
       from_secret: docker_username