Update Dockerfile

1 job for master in 7 minutes and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build And Push
failed #12910


Name Stage Failure
build-and-push-job Build And Push
  Downloading xlrd-1.2.0-py2.py3-none-any.whl (103 kB)
Collecting astropy
Downloading astropy-4.0.1.post1-cp37-cp37m-manylinux1_x86_64.whl (6.5 MB)
Collecting numpy
Downloading numpy-1.18.3-cp37-cp37m-manylinux1_x86_64.whl (20.2 MB)
ERROR: Could not find a version that satisfies the requirement r-irkernel (from versions: none)
ERROR: No matching distribution found for r-irkernel
error building image: error building stage: failed to execute command: waiting for process to exit: exit status 1
ERROR: Job failed: command terminated with exit code 1