Fixed duplicate flag.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
4 jobs for bugfix/fix_ci_connection in 5 seconds (queued for 7 minutes and 40 seconds)
Name Stage Failure
failed
test_py_tools_ds Test
Running with gitlab-runner 13.3.1 (738bbe5a)
on py_tools_ds_ci_v0.15.2 FwrueGyZ
Preparing the "docker" executor
Using Docker executor with image py_tools_ds_ci:0.15.2 ...
Pulling docker image py_tools_ds_ci:0.15.2 ...
ERROR: Job failed: Error response from daemon: pull access denied for py_tools_ds_ci, repository does not exist or may require 'docker login': denied: requested access to the resource is denied (docker.go:142:1s)
failed
test_styles Test
Running with gitlab-runner 13.3.1 (738bbe5a)
on py_tools_ds_ci_v0.15.2 89hJ1FUx
Preparing the "docker" executor
Using Docker executor with image py_tools_ds_ci:0.15.2 ...
Pulling docker image py_tools_ds_ci:0.15.2 ...
ERROR: Job failed: Error response from daemon: pull access denied for py_tools_ds_ci, repository does not exist or may require 'docker login': denied: requested access to the resource is denied (docker.go:142:1s)