Update environment.yml

5 jobs for master in 7 seconds (queued for 1 second)
Name Stage Failure
singularity-image Build
  sif         siftool is a program for Singularity Image Format (SIF) file manipulation
sign Attach a cryptographic signature to an image
test Run the user-defined tests within a container
verify Verify cryptographic signatures attached to an image
version Show the version for Singularity

Run 'singularity --help' for more detailed usage information.
Cleaning up file based variables
ERROR: Job failed: exit code 1