Fix for #81

[gilesknap]

Changes to the schema for defining the startup script as described in #81

[codecov-commenter]

Codecov Report

Merging #84 (8f2aace) into main (41e06fb) will increase coverage by 0.35%.
The diff coverage is 97.77%.

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@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
+ Coverage   97.38%   97.73%   +0.35%     
==========================================
  Files           9        9              
  Lines         382      397      +15     
==========================================
+ Hits          372      388      +16     
+ Misses         10        9       -1     

Impacted Files	Coverage Δ
src/ibek/gen_scripts.py	100.00% <ø> (ø)
src/ibek/render.py	97.75% <96.15%> (+1.24%)	⬆️
src/ibek/support.py	98.95% <100.00%> (+0.14%)	⬆️

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[gilesknap]

I'm merging this in order to work on Pydantic conversion. I will come back to the very latest updates to the schema in #81 after pydantic conversion.