Add a modified atlas-grid-centos7 image that has some python libraries installed via pip

This modification to the image is a temporary workaround to run ATLAS jobs on Kubernetes.

recipe.yaml

@@ -30,6 +30,7 @@ input:
     - 'https://registry.hub.docker.com/atlasml/atlasml-base:py-3.6.8'
     - 'https://registry.hub.docker.com/atlasml/atlasml-base:py-3.7.2'
     - 'https://registry.hub.docker.com/atlasadc/atlas-grid-centos7:latest'
+    - 'https://cloud.docker.com/repository/docker/danikam/atlas-grid-centos7-pip'
     - 'https://registry.hub.docker.com/lofaruser/imaging-pipeline:v0.2'
     - 'https://registry.hub.docker.com/clelange/cms-higgs-4l-full:latest'
     - 'https://gitlab-registry.cern.ch/clange/jetmetanalysis:latest'