Fix release asset build path (Fixes #1)

[p0dalirius]

Linked Issue

Closes #1

Root Cause

The release build step used a parent-relative output directory while the following staging step used a repository-relative input directory. The workflow therefore built the binary outside the directory searched by asset preparation.

Fix Description

Create the repository-local ./build directory and write the binary there. This makes the build output match the existing staging and upload paths while preserving the binary name and release filename format.

How Verified

• Runtime: go test ./... passes.
• Runtime: executed the corrected Linux/amd64 build command and the unchanged staging copy; ./release/DescribeKeyCredentialLink-linux-amd64 was present afterward.
• Static: actionlint v1.7.7 passes with only the repository pre-existing legacy-action version diagnostics excluded.
• Static: git diff --check passes.

Test Coverage

None: The defect is in release workflow path integration rather than application code. The exact corrected build and staging commands were executed end to end.

Scope of Change

• Files changed: .github/workflows/release.yaml
• Submodule pointer updated: no
• Behavioral changes outside the bug fix: none

Risk and Rollout

The change only relocates generated build output into the directory already consumed by release staging. Binary names, build flags, target matrices, and upload behavior are unchanged.