photon: Ensure grub2 and gawk are installed

[randomvariable]

Change description

Can help if user wants to change kernel options post-boot

Related issues

• Fixes #

Additional context

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[AverageMarcus]

/lgtm

/assign @mboersma @drew-viles

[mboersma]

Should we install these by default though? I think the overall idea is to produce minimal images, so you could argue this is a user-specific addition.

[mboersma]

Could we make this an optional install that defaults to false, like in #1452?

[drew-viles]

I'd agree these should be optional additions as not everyone is going to want/need these packages installed.

[mboersma]

Another way to make this an optional install is to use the debug_tools variable that we have defined elsewhere (although it only seems to be used currently in Windows builds). I did this in #1458, for example.

[randomvariable]

I'll make these changes, apparently the Photon team says grub2-mkconfig isn't used, which is interesting.

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