[gitlab] Remove .conda and .condarc from docker image

The current conda-concourse-ci includes wrong configuration

.gitlab-ci.yml

@@ -61,6 +61,9 @@ build_linux_36:
 # Deploy targets
 .deploy_template: &deploy_job
   stage: deploy
+  before_script:
+    - "[ -r /root/.condarc ] && rm -f /root/.condarc"
+    - "[ -d /root/.conda ] && rm -rf /root/.conda"
   script:
     - curl --silent "${BOOTSTRAP}" --output "bootstrap.py"
     - python3 bootstrap.py channel base