[3alpha]

Context

Fix the SPEC-M03 warning reported by the package specification checks. The legacy upstreamRepo, upstreamVersion and upstreamArg fields are deprecated.

Approach

Replace the legacy fields with upstream: [{ repo, version, arg }]: paritytech/parity-ethereum, v2.6.4, PARITY_VERSION.

Recover paritytech/parity-ethereum and PARITY_VERSION from the Dockerfile. Declare v2.6.4, including the prefix already used by the actual checkout, and pass that same existing pin explicitly from compose.

Test instructions

Validate this branch with the SDK package-spec checker from the linked PR and confirm that no SPEC-M03 findings remain.

Verified locally:

• Loaded 1 package using the SDK, including merged variant manifests where present.
• SPEC-M03 findings: 1 → 0; total spec findings: 2 → 1; no new findings under other rules.
• Compared manifest schemas and effective compose against the default branch: no new schema failures or service runtime changes.
• git diff --check passes.
• docker compose config --quiet passes.

Container images were not built locally.