Use nightly-6.4.x-jammy image for the 6.4.x docs build - #166
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…ch build The nightly-main-jammy image builds docc from swift's main branch, which has a Foundation/docc regression that crashes with Illegal instruction (SIGILL) in libFoundationXML while rendering swift-package-manager's RegistryServerSpecification.md (raw <details> HTML wrapping a JSON code fence). Verified that image is not affected: docc renders that page and a full combined build succeeds cleanly with nightly-6.4.x-jammy, which tracks this branch's own release/6.4.x nightly instead of main.
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Summary
Switches the branch used to build the release/6.4.x from
swiftlang/swift:nightly-main-jammytoswiftlang/swift:nightly-6.4.x-jammy.Ideal longer term would be using the swift:6.4 images, but those aren't published yet.
This works around an issue that started appearing on Sept 10th with docc building SwiftPM documentation using the
swiftlang/swift:nightly-main-jammyimage. This only resolves the build issues for therelease/6.4.xbranch, which is published to docs.swift.org/latest/documentation, to ideally re-enable nightly updatesIllegal instruction(SIGILL) insidelibFoundationXML.so(XMLElement.__allocating_init(xmlString:), from swift-docc'sMarkdownRenderer.visit) while renderingswift-package-manager'sSources/PackageManagerDocs/Documentation.docc/RegistryServerSpecification.md, which contains a raw HTML<details><summary>...</summary>...</details>block wrapping a JSON code fence.Test plan
swift package generate-documentation --target PackageManagerDocs --experimental-enable-custom-templates --enable-mentioned-incompletes successfully (exit 0, archive generated,RegistryServerSpecificationpage rendered) withswiftlang/swift:nightly-6.4.x-jammy.scripts/build_docs.pyend-to-end underswiftlang/swift:nightly-6.4.x-jammywith a clean workspace — all 23 documentation sources (including swiftpm, swift-testing, docc-documentation, embedded-swift, swift-wasm) built successfully.release/6.4.xwith the updated image.