build with go 1.25, update gh actions

[mwennrich]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @mwennrich, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on updating the Go version used within the project. The primary change involves migrating the build environment and module definition from Go 1.24 to Go 1.25. This ensures the application is built and run with the latest stable Go release, potentially leveraging new features, performance improvements, and security updates.

Highlights

• Go Version Update: The project's Go version has been upgraded from 1.24 to 1.25, affecting both the Docker build environment and the go.mod file.

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[gemini-code-assist]

Code Review

This pull request updates the Go version to 1.25 in the Dockerfile and go.mod file. The changes are straightforward and achieve the intended goal. I have added one suggestion to the Dockerfile to pin the base image to a specific version for improved build reproducibility. Additionally, the pull request title mentions updating GitHub Actions, but no corresponding workflow file changes were found. You may want to confirm if those changes were intended to be included.