Add TARDIS ref parameter on pipeline template

[epassaro]

Description

This PR will allow pipelines to run unit test or reference data tests with a specific TARDIS version given by a reference (commit, tag, branch). This has some limitations due to the nature of conda environments: you can checkout and install any version of the environment file you want, but this environment is solved differently (or maybe unsolvable). A solution for this needs to be discussed with the core team. See: conda/conda#7248.

Motivation and Context

Improves the current pipeline template.

How Has This Been Tested?

• Testing pipeline
• Reference Data Comparison following these instructions
• Other (please describe)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• None of the above (please describe)

Checklist:

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have built the documentation on my fork following these instructions
• I have assigned and requested two reviewers for this pull request

[codecov]

Codecov Report

Merging #1534 (b896d8d) into master (c14b2cd) will not change coverage.
The diff coverage is n/a.

❗ Current head b896d8d differs from pull request most recent head ea3ae2c. Consider uploading reports for the commit ea3ae2c to get more accurate results

@@           Coverage Diff           @@
##           master    #1534   +/-   ##
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  Coverage   67.57%   67.57%           
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  Files          68       68           
  Lines        6103     6103           
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  Hits         4124     4124           
  Misses       1979     1979           

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[andrewfullard]

I would like to see the documentation of this feature included as part of the PR

[epassaro]

Ok. Notice that this feature has some limitations due to the reproducibility of old environments (see TEP013).