Merge branch 'rf/wrong_image' into 'master'

RF: Use fsldevel image, as it has system libs (libGL for pyopengl)

See merge request fsl/conda/manifest!2

.gitlab-ci.yml

@@ -118,7 +118,7 @@ test-environment:macos-64:
 
 test-environment:linux-64:
   extends: .test-environments
-  image:   continuumio/miniconda3
+  image:   fsldevelopment/fsl-linux-64
   variables:
     SUFFIX: "linux-64"