Allow variable memory for motioncorr via slurm

[stephen-riggs]

Unexpectly large raw data files cause the motion correction service to crash when going to slurm, and there was no way of adjusting that memory request. This adds a memory option to the motion correction service inputs.

Also, this creates a common Dockerfile for Relion, to act as a base for motion correction and class selection and speed up image creation.

The memory aspects will need revisiting in future if the microscopes get large cameras.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.72%. Comparing base (2226cef) to head (bfa9481).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #225   +/-   ##
=======================================
  Coverage   82.72%   82.72%           
=======================================
  Files          62       62           
  Lines        8115     8116    +1     
  Branches     1131     1131           
=======================================
+ Hits         6713     6714    +1     
  Misses        960      960           
  Partials      442      442           

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