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doc: update the cache writer identities for R2 uploads - #87

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marcelolynch wants to merge 2 commits into
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2026/10/CacheAzureWriterNote
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marcelolynch wants to merge 2 commits into
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2026/10/CacheAzureWriterNote

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@marcelolynch marcelolynch commented Oct 13, 2026 •

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This PR updates the cache writer identities in docs/github-apps/entra-apps.md.

mathlib4 CI uploads the build cache to R2 with a short-lived S3-compatible key pair from the cache broker. The section now describes this credential first.

The four Azure writer identities stay in the table, with a new column. The column names the mathlib4 workflow trees that use each identity:

A release tag or a release branch runs the workflows of its own tree, so an older release line can still use these identities.

The PR also updates the entra-apps.md entry in INDEX.md.

Merge this PR after leanprover-community/mathlib4#44832.

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@marcelolynch marcelolynch changed the title doc: record why the Azure master cache writer is still needed doc: update the cache writer identities for R2 uploads Oct 13, 2026
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