Fix cache race condition in parallel integration tests

[Copilot]

Parallel integration test jobs were failing during cache restoration with "File exists" tar errors. All jobs shared the same cache key, causing extraction conflicts when running simultaneously.

Changes

Cache key uniqueness

• Added matrix.test-group.name to integration job cache keys
• Prevents simultaneous cache writes from conflicting
• Maintains cache efficiency through restore-keys fallback

# Before: all integration jobs shared this key
key: ${{ runner.os }}-go-modules-${{ hashFiles('**/go.sum') }}

# After: each test group has unique key
key: ${{ runner.os }}-go-modules-${{ matrix.test-group.name }}-${{ hashFiles('**/go.sum') }}
restore-keys: |
  ${{ runner.os }}-go-modules-${{ matrix.test-group.name }}-
  ${{ runner.os }}-go-modules-

Scope

• Only affects integration job matrix (53 parallel jobs)
• Other jobs already use unique keys via runner.os or run serially

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/github/gh-aw/actions/jobs/62451550971/logs
  • Triggering command: /usr/bin/curl curl -s -L -H Accept: application/vnd.github+json -H Authorization: ****** --gdwarf-5 --64 -o x_amd64/compile -I g/cli/.github/workflows o x_amd64/compile --gdwarf-5 --64 -o x_amd64/compile (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Fix the failing GitHub Actions workflow Integration: CLI Completion & Other
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 62451550971
Job URL: https://github.com/github/gh-aw/actions/runs/21662949681/job/62451550971

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[Copilot]

Pull request overview

Fixes a CI cache race condition in the Integration: CLI Completion & Other GitHub Actions job by scoping Go module caches per test group in the integration test matrix.

Changes:

• Updated the Go modules cache key in the integration job to include ${{ matrix.test-group.name }} so each test group uses a distinct cache entry.
• Added a group-specific restore-keys prefix while retaining a generic Go modules fallback cache to preserve reuse where possible.

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