add auto generating changlog to workflow

[joshlynchONS]

Added code for an auto generating changelog to the workflow.

Checklists

This pull/merge request meets the following requirements:

• code runs
• developments are ethical and secure
• you have made proportionate checks that the code works correctly
• you have tested the build of the template
• test suite passes
• minimum usable documentation written in the docs folder

Comments have been added below around the incomplete checks.

[codecov-commenter]

Codecov Report

Merging #68 (7e1407a) into main (6541223) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #68   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           29        29           
=========================================
  Hits            29        29           

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