Add line to dockerfile to point image to use cran repo for dependencies #74
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This PR adds a line to
Dockerfile
to address an error that came up while running the GH actionbuild
.The error suggests that the Dockerfile is trying to install r packages from
mran.microsoft.com
but couldn't reach that host. Some googling led me to this Issue on the repo for the base docker image we're using. It seems the mran host is unreliable so adding this change should point the docker image at cran.studio.org for package downloads, which is hopefully more stable.