chore: make releases workflow-only

script/prepare-release.sh

@@ -1,18 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-if [[ $# -ne 1 ]]; then
-  echo "usage: $0 <version>" >&2
-  exit 2
-fi
-
-repo_root="$(cd "$(dirname "$0")/.." && pwd)"
-release_date="$(date -u +%F)"
-
-go run ./cmd/vociferate \
-  --root "$repo_root" \
-  --version "$1" \
-  --date "$release_date" \
-  --version-file internal/vociferate/version/version.go \
-  --version-pattern 'const String = "([^"]+)"' \
-  --changelog changelog.md