🔧 fix: bump dagger v0.20.6 → v0.20.8

[yeazelm]

Summary

• The release pipeline has been failing because the engine pinned in dagger.json (v0.20.6) and the CLI installed by dagger-for-github no longer round-trip cleanly with the current daggerverse modules. The version handshake fails before dagger call reaches user code.
• Bumps engineVersion in dagger.json and DAGGER_VERSION in all workflows to v0.20.8, matching the rest of the org repos (e.g. paper PR 🧹 chore: fixup for cutting release with bot app #40) that have already moved.

Refs PCC-543

Test plan

• CI workflow passes on this PR
• Release / cut-release workflows succeed on the next tag push

[linear-code]

PCC-543

[greptile-apps]

Greptile Summary

This PR bumps the Dagger version from v0.20.6 to v0.20.8 across all GitHub Actions workflows and dagger.json to resolve a version handshake failure that was breaking the release pipeline.

• dagger.json: engineVersion updated from v0.20.6 to v0.20.8, keeping the engine pin in sync with the CLI.
• All 5 workflows (ci.yaml, cut-release.yaml, nightly.yaml, pr.yaml, release.yaml): DAGGER_VERSION env var updated consistently to 0.20.8.

Confidence Score: 5/5

All six files receive a single, identical version-string change that is consistent throughout the PR — safe to merge.

The change is a mechanical, uniform version bump applied identically to every workflow file and the engine pin in dagger.json. The CLI version and the engine version now agree, which is exactly what the Dagger version-handshake requires. No logic, permissions, secrets handling, or workflow structure was touched.

No files require special attention.

Important Files Changed

Filename	Overview
dagger.json	Bumps engineVersion from v0.20.6 to v0.20.8 to match the updated CLI version in all workflows.
.github/workflows/ci.yaml	Bumps DAGGER_VERSION env var from 0.20.6 to 0.20.8; no other changes.
.github/workflows/cut-release.yaml	Bumps DAGGER_VERSION env var from 0.20.6 to 0.20.8; no other changes.
.github/workflows/nightly.yaml	Bumps DAGGER_VERSION env var from 0.20.6 to 0.20.8; no other changes.
.github/workflows/pr.yaml	Bumps DAGGER_VERSION env var from 0.20.6 to 0.20.8; no other changes.
.github/workflows/release.yaml	Bumps DAGGER_VERSION env var from 0.20.6 to 0.20.8; no other changes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["dagger-for-github\n(CLI v0.20.8)"] --> B{"Version handshake\nCLI == engineVersion?"}
    B -- "✅ Match (v0.20.8)" --> C["dagger call proceeds"]
    B -- "❌ Mismatch (was v0.20.6)" --> D["Handshake failure\nPipeline aborted"]
    C --> E["ci / pr / nightly / release / cut-release"]

    style D fill:#f88,color:#000
    style C fill:#8f8,color:#000

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_{Reviews (1): Last reviewed commit: "🔧 fix: bump dagger v0.20.6 → v0.20.8" | Re-trigger Greptile}