Set GOTOOLCHAIN=go1.25.7 in konflux.Dockerfile

[kaovilai]

Summary

• Override toolchain go1.25.8 from go.mod with GOTOOLCHAIN=go1.25.7 in the Konflux builder stage
• go1.25.8 is not yet available in the builder image; this pins to go1.25.7 to unblock builds

Test plan

• Konflux build succeeds with go1.25.7

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaovilai

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[Copilot]

Pull request overview

Pins the Go toolchain used by the Konflux hermetic build to unblock builds when the toolchain go1.25.8 directive from go.mod cannot be satisfied by the current builder image.

Changes:

• Add ENV GOTOOLCHAIN=go1.25.7 to the Konflux builder stage to override Go’s toolchain selection.

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[Copilot]

Setting GOTOOLCHAIN=go1.25.7 in a hermetic Konflux build can become brittle: if/when the builder image is updated to ship a different patch (e.g. go1.25.8), go may try to switch to/go-download 1.25.7 (which likely fails in a hermetic environment). Consider using GOTOOLCHAIN=local to force using the toolchain already present in the image (still bypassing the toolchain go1.25.8 directive), or add an explicit note/TODO describing when/how this pin should be removed/updated alongside the builder image tag.

Suggested change

	ENV GOTOOLCHAIN=go1.25.7
	ENV GOTOOLCHAIN=local

[kaovilai]

Closing in favor of openshift-eng/ocp-build-data#9788 which negates the need for this change.