ci(integration): bump Dagger Go base image to 1.25-alpine

[professorice]

Summary

The Dagger integration test containers and the new-generator example documentation pin the Go base image to golang:1.24-alpine, but go.mod requires go >= 1.25.0. As a result, the Generator Integration Tests workflow fails on every PR with:

go: go.mod requires go >= 1.25.0 (running go 1.24.13; GOTOOLCHAIN=local)

This affects every open PR — including the maintainers' own release PR (#234) — because the CLI is rebuilt inside the 1.24 container during the C#, Node.js, Angular, and Go integration runs.

This change bumps the base image to golang:1.25-alpine in:

• test/integration/cmd/csharp/run.go
• test/integration/cmd/nodejs/run.go
• test/integration/cmd/angular/run.go
• test/integration/cmd/go/run.go (2 occurrences — CLI build container and Go fixture compile container)
• test/new-generator.md (the documented example for adding a new generator)

The toolchain go1.24.1 line in test/go-integration/go.mod is a minimum-toolchain directive and still satisfied by Go 1.25, so it is left alone.

Test plan

• go build ./... succeeds
• go test ./... passes
• make ci passes locally (fmt, lint, test, verify-generate)
• Generator Integration Tests pass in CI on this PR (the actual smoke test)

Made with Cursor

[gemini-code-assist]

Code Review

This pull request updates the Go base image version from 1.24-alpine to 1.25-alpine across multiple integration test files and documentation. The review feedback highlights opportunities to improve maintainability by centralizing the hardcoded version string and base container setup into shared constants or variables, reducing redundancy across the test suite.