build: source resolute toolchain from rustc-release PPA and pin vendor_rust to 1.96.0#232
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…r_rust to 1.96.0 Verified against the ~lablup/+archive/ubuntu/rustc-release PPA that rustc-1.96 is published for jammy, noble, and resolute at 1.96.0+dfsg1. Two adjustments follow from that: Resolute (Ubuntu 26.04) now documents the same dependent-PPA toolchain source as jammy and noble instead of claiming it builds from the archive without the dependency PPA, since the rustc-release PPA serves 26.04 too and debian/control already prefers the versioned rustc-1.96 alternative. vendor_rust drops from 1.96.1 to 1.96.0 so the runner-side lockfile validation and cargo vendor step use the exact patch Launchpad compiles with, eliminating any patch-level skew between the vendoring toolchain and the build toolchain.
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Summary
Follow-up to #231. Verified the actual state of the
~lablup/+archive/ubuntu/rustc-releasePPA and adjusted the packaging config to match reality.PPA verification
Queried the Launchpad API (
getPublishedSources).rustc-1.96is published for all three target series:So the #231 precondition (PPA must ship
rustc-1.96/cargo-1.96) is already satisfied, and the PPA serves Resolute (26.04) as well. The PPA patch is 1.96.0, not 1.96.1.Changes
launchpad_ppa.ymlanddebian/README.packaging, instead of claiming it builds from the 26.04 archive without the dependency PPA.debian/controlalready prefers the versionedrustc-1.96alternative, so no control change is needed.vendor_rustdrops from 1.96.1 to 1.96.0 for all distros so the runner-side lockfile validation andcargo vendorstep run on the exact patch Launchpad compiles with, removing any patch-level skew between the vendoring toolchain and the build toolchain.Verification
Workflow and docs only; no Rust source or
debian/controlbuild-deps changed.