Add the host_binaries feature

[gilesknap]

Adds an option to the apptainer type app.

This allows you to list a set of binaries that should be discovered on the host using path and then mounted into the apptainer at /usr/bin.

Also adds:

• schema annotations for the options fields
• a test that validates the demo_configuration
• an example module edge-containers-cli in demo_configuration that demonstrates the use of host_binaries

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.14%. Comparing base (32ef01f) to head (68e026c).

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #25       +/-   ##
===========================================
+ Coverage   42.55%   75.14%   +32.58%     
===========================================
  Files          23       23               
  Lines         860      865        +5     
===========================================
+ Hits          366      650      +284     
+ Misses        494      215      -279     

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[MJGaughran]

What is meant by 'samples'?

[gilesknap]

samples is sample output from the sample (demo) definitions. I guess I'm just copying how I did things in ibek here - happy to use a different name but what?

[MJGaughran]

Apparently this type of testing can be called:

• Snapshot testing
• Golden Master testing
• Comparison testing

Since we already use 'snapshot' to refer to something else, perhaps we can use 'comparison_master' instead of 'samples', and put a brief description in the generation script, including the name of the test?

Also rename the test to:
test_compare_demo_configuration_output_to_comparison_master()?

A bit of a mouthful, but at least it's explicit. You could drop 'configuration', too.

[MJGaughran]

Make sure you reword the VSCode Task description for the comparison_master generation.

[MJGaughran]

Needs to be removed