adds platform environment variables related content from the spec#771

Merged

AidanDelaney merged 6 commits intobuildpacks:mainfrom hyounes4560:add-platform-env-related-page

Nov 4, 2024

+34

Commits on Oct 7, 2024

adds platform env var related content from the spec
hyounes4560
committed

Commits on Oct 11, 2024

adds reviewers feedback
hyounes4560
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Commits on Oct 26, 2024

Commits on Oct 30, 2024

added an example
hyounes4560
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