#1097 - add workflow for generating changelog after releases

[louise-davies]

Description

See title. I don't know how to test this though...

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• Review code
• Check Actions build
• Review changes to test coverage

Agile board tracking

Closes #1097

[codecov]

Codecov Report

Merging #1098 (743a6f3) into develop (a190ed5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1098   +/-   ##
========================================
  Coverage    97.97%   97.97%           
========================================
  Files           42       42           
  Lines         1579     1579           
  Branches       411      411           
========================================
  Hits          1547     1547           
  Misses          31       31           
  Partials         1        1           

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[louise-davies]

I'm going to close this and come in with a PR from my fork once I've got everything working