nextflow_fileurl

dockerfile = 'https://raw.githubusercontent.com/pcantalupo/ViraVate/master/Dockerfile'
println dockerfile   // print variable

file_dockerfile = file(dockerfile)
println file_dockerfile.text    // print contents of file (pulled from remote location)

df_ch = Channel.fromPath(dockerfile)

process foo {
  echo true

  input:
  file(dockerfile) from df_ch

  script:
  """
  head $dockerfile
  """

}