Automate Go version updates via scheduled workflow

[Copilot]

Manual Go version updates require tracking releases and updating multiple files with different version format requirements. This workflow automates the process.

Implementation

Workflow: .github/workflows/go-version-update.yml

• Queries go.dev/dl/?mode=json for latest release
• Compares against MODULE.bazel version
• Updates on version mismatch:
  • MODULE.bazel → go_sdk.download(version = "1.26.0")
  • go/extractor/go.mod → go 1.26 and toolchain go1.26.0
  • go/extractor/autobuilder/build-environment.go → maxGoVersion = "1.26"
  • go/actions/test/action.yml → default: "~1.26.0"
• Creates/updates PR on workflow/go-version-update branch
• Schedule: Weekly on Mondays at 3 AM UTC

Excluded from automation:

• go/ql/** - Query-specific code requiring manual review
• docs/** - Documentation requiring manual updates

Technical Details

• Uses sed -E for cross-platform regex compatibility (GNU/BSD)
• Escapes version strings for safe regex patterns
• Validates API responses and version extraction
• Deduplicates PRs via branch check
• Fails fast on malformed data

Example

When Go 1.27.0 releases:

Current: 1.26.0 → Latest: 1.27.0
Updates 4 files → Commits to workflow/go-version-update → Creates PR "Go: Update to 1.27"

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