Mantid versions: latest & nightly

[james0209]

Summary of work

• Create 2 main Dockerfiles: one for queue-processor; one for queue-processor with Mantid in the environment

• Version of Mantid required (latest stable or latest nightly) can be passed as a build-arg (defaults to latest stable)

• Dockerfile uses multi-stage builds to reduce final image size

• Make use of conda-pack to reduce Image size. A tool that let’s you package a Conda environment into a standalone environment, with no need for the Conda toolchain. Once environment has been packaged that way, it can be copied into a new smaller image that only contains the self-contained environment

• Remove unused function generating fake test data

[codecov]

Codecov Report

Merging #1463 (4d5bf0a) into main (b6f467e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1463   +/-   ##
=======================================
  Coverage   89.84%   89.84%           
=======================================
  Files          17       17           
  Lines         827      827           
=======================================
  Hits          743      743           
  Misses         84       84           

Flag	Coverage Δ
backend	89.84% <ø> (ø)

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