update lead version to Go 1.25

[dragonsinth]

Part of #528

[Copilot]

Pull request overview

This pull request attempts to update the lead Go version from 1.23 to 1.25 across Docker and CI configurations. The changes include modernizing Dockerfile syntax (MAINTAINER to LABEL, lowercase to uppercase AS) and updating the CircleCI build matrix to remove Go 1.22 and add Go 1.25 testing.

Changes:

• Updates Dockerfile to use Go 1.25 and modernizes Dockerfile syntax
• Adds Go 1.25 build job to CircleCI configuration
• Removes Go 1.22 build job from CircleCI workflow

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Dockerfile	Updates base image from golang:1.23-alpine to 1.25-alpine; modernizes MAINTAINER to LABEL syntax and capitalizes AS keyword in multi-stage builds
.circleci/config.yml	Removes build-1-22 job, adds build-1-25 job to test matrix, and updates workflow to include Go 1.25 testing

Comments suppressed due to low confidence (1)

.circleci/config.yml:33

• The build-1-25 job uses different steps than build-1-23 and build-1-24. While build-1-23 and build-1-24 use the shared simple_job_steps anchor that runs 'make test', build-1-25 explicitly defines its steps to run 'make ci'. This inconsistency means that Go 1.25 (which would be the lead version) runs different commands than the other versions. Consider using the same simple_job_steps anchor for consistency, or if 'make ci' should be the standard, update all jobs to use it.

    steps:
      - checkout
      - run:
          name: Run tests and linters
          command: |
            make ci

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