Change the way "inherited" workspaces retrieve the base workspace code

[jonnyry]

Resolves #4162

What is being addressed

Change the way inherited workspaces retrieve the base workspace code - see solution description in #4162

Notes

1. Currently requires the 'canary' release of porter. Ideally this should be a pinned version, however we are waiting for a new version release which includes the --build-context parameter.

[github-actions]

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[tim-allen-ck]

so do you need to have built base first? Will it just use the latest version of base?

[jonnyry]

so do you need to have built base first? Will it just use the latest version of base?

you don't need to have base built first, it pulls the latest files from the ../base directory, by using the 'base' --build-context passed to porter build.

[tim-allen-ck]

so do you need to have built base first? Will it just use the latest version of base?

you don't need to have base built first, it pulls the latest files from the ../base directory, by using the 'base' --build-context passed to porter build.

Ahh got you. Nice. Happy to approve will test later