Fix release pipeline: Update Dockerfile to use Go 1.25

[Copilot]

Release pipeline failing with go mod download exit code 1 due to Go version mismatch between Dockerfile (golang:1.24-alpine) and go.mod requirement (go 1.25.1).

Changes

• Updated Dockerfile base image from golang:1.24-alpine to golang:1.25-alpine

FROM golang:1.25-alpine AS builder

Original prompt

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This section details on the original issue you should resolve

<issue_title>Release pipeline failed</issue_title>
<issue_description>The release pipeline is failed with error
Error: buildx failed with: ERROR: failed to build: failed to solve: process "/bin/sh -c go mod download" did not complete successfully: exit code: 1
https://github.com/finnng/k8s-node-proxy/actions/runs/19752586624
Please investigate and resolve
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Release pipeline failed #5

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[Copilot]

Pull request overview

This PR fixes a release pipeline failure caused by a Go version mismatch between the Dockerfile and go.mod. The Dockerfile was using Go 1.24 while go.mod required Go 1.25.1, causing the go mod download command to fail during the Docker build process.

Key Changes:

• Updated Dockerfile base image from golang:1.24-alpine to golang:1.25-alpine to match the go.mod requirement

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