fix: use GORELEASER_CURRENT_TAG for RC release detection

[miguelsanchez-upsun]

Summary

Fixes RC release builds by ensuring the Makefile correctly detects pre-release versions and skips Cloudsmith uploads.

Changes

• Updated Makefile to use GORELEASER_CURRENT_TAG (set by GitHub Actions) instead of git describe --always, which was returning commit hashes instead of tag
  names in shallow checkouts
• Added shebang and error handling to cloudsmith.sh for safety

Result

RC releases (e.g., v5.10.0-rc1) now properly skip Cloudsmith uploads instead of failing when attempting to run the upload script.

[Copilot]

Pull request overview

Fixes release/RC detection in CI by sourcing the version from GORELEASER_CURRENT_TAG (provided by GitHub Actions) instead of relying on git describe in shallow checkouts, and tightens the Cloudsmith upload script’s shell safety settings.

Changes:

• Update Makefile version resolution to prefer GORELEASER_CURRENT_TAG, with a git-based fallback.
• Add a bash shebang and strict-mode error handling (set -euo pipefail) to cloudsmith.sh.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
Makefile	Adjusts how VERSION is derived to avoid shallow-checkout git describe pitfalls and improve RC detection behavior.
cloudsmith.sh	Adds bash strict mode to make Cloudsmith uploads fail fast on errors.

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