build: package releases with nFPM under the PGSTY identity

Replace minio/pkger's hard-coded upstream identity with an in-tree nFPM configuration. Packages now name PGSTY as vendor and maintainer, use the SILO homepage and SPDX license, and preserve the established package names, versions, payload paths, modes, and checksum format.

Resolve both the release binary and systemd unit independently of the caller's working directory. The release and test workflows share the same package script, while the signing script consumes the same final metadata contract.

Co-authored-by: ChatGPT <noreply@openai.com>
Co-authored-by: Claude <noreply@anthropic.com>

buildscripts/package-release.sh

@@ -0,0 +1,120 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+repo_dir="$(cd "${script_dir}/.." && pwd)"
+dist_dir="${DIST_DIR:-${repo_dir}/dist}"
+nfpm_config="${NFPM_CONFIG:-${repo_dir}/.github/nfpm.yml}"
+
+if [ -z "${PKG_VERSION:-}" ]; then
+  echo "PKG_VERSION is required" >&2
+  exit 1
+fi
+
+# Re-validate the shape release.yml derived from the tag. The packages are
+# named from this, so a malformed value would ship under a name no repository
+# can order against.
+if ! [[ "${PKG_VERSION}" =~ ^[0-9]{14}\.0\.0$ ]]; then
+  echo "Invalid PKG_VERSION: ${PKG_VERSION}" >&2
+  exit 1
+fi
+
+if ! command -v nfpm >/dev/null 2>&1; then
+  echo "nfpm is required" >&2
+  exit 1
+fi
+
+if [ ! -f "${nfpm_config}" ]; then
+  echo "Missing nFPM config: ${nfpm_config}" >&2
+  exit 1
+fi
+
+# nfpm resolves a relative content src against the current directory, not
+# against the config file, so the unit path is passed in absolute. Otherwise
+# this only works when invoked from the repository root and fails elsewhere on
+# a message that names the file rather than the cause.
+unit_file="${repo_dir}/minio.service"
+if [ ! -f "${unit_file}" ]; then
+  echo "Missing systemd unit: ${unit_file}" >&2
+  exit 1
+fi
+
+packages_dir="${dist_dir}/packages"
+mkdir -p "${packages_dir}"
+
+# Two spaces, no trailing newline: sign-release-rpms.sh parses these files to
+# check download integrity before it signs, and regenerates them afterwards in
+# the same shape.
+sha256_file() {
+  local file="$1"
+  local digest
+
+  if command -v sha256sum >/dev/null 2>&1; then
+    digest="$(sha256sum "${file}" | awk '{print $1}')"
+  else
+    digest="$(shasum -a 256 "${file}" | awk '{print $1}')"
+  fi
+
+  printf '%s  %s' "${digest}" "$(basename "${file}")" > "${file}.sha256sum"
+}
+
+find_binary() {
+  local goarch="$1"
+  local matches
+  local count
+
+  # Must resolve to exactly one binary. Picking the first of several build
+  # variants (an added goamd64 level, a stale dist entry) would silently ship a
+  # package whose contents do not match its name.
+  matches="$(find "${dist_dir}" -maxdepth 2 -type f \
+    -path "${dist_dir}/minio_linux_${goarch}*/minio" | sort)"
+  count="$(printf '%s' "${matches}" | grep -c . || true)"
+
+  if [ "${count}" -eq 0 ]; then
+    echo "Missing GoReleaser binary for linux/${goarch}" >&2
+    exit 1
+  fi
+  if [ "${count}" -ne 1 ]; then
+    echo "Expected exactly one GoReleaser binary for linux/${goarch}, found ${count}:" >&2
+    printf '%s\n' "${matches}" >&2
+    exit 1
+  fi
+
+  printf '%s\n' "${matches}"
+}
+
+build_arch() {
+  local goarch="$1"
+  local rpm_arch="$2"
+  local deb_arch="$3"
+  local apk_arch="$4"
+  local source
+  local rpm_file
+  local deb_file
+  local apk_file
+
+  source="$(find_binary "${goarch}")"
+
+  # These names are the public download names and must not drift; RPM carries a
+  # release number, DEB and APK do not, matching what pkger produced.
+  rpm_file="${packages_dir}/minio-${PKG_VERSION}-1.${rpm_arch}.rpm"
+  deb_file="${packages_dir}/minio_${PKG_VERSION}_${deb_arch}.deb"
+  apk_file="${packages_dir}/minio_${PKG_VERSION}_${apk_arch}.apk"
+
+  PKG_VERSION="${PKG_VERSION}" NFPM_RELEASE=1 NFPM_ARCH="${goarch}" NFPM_SOURCE="${source}" NFPM_UNIT="${unit_file}" \
+    nfpm package --config "${nfpm_config}" --packager rpm --target "${rpm_file}"
+  PKG_VERSION="${PKG_VERSION}" NFPM_RELEASE='' NFPM_ARCH="${goarch}" NFPM_SOURCE="${source}" NFPM_UNIT="${unit_file}" \
+    nfpm package --config "${nfpm_config}" --packager deb --target "${deb_file}"
+  PKG_VERSION="${PKG_VERSION}" NFPM_RELEASE='' NFPM_ARCH="${goarch}" NFPM_SOURCE="${source}" NFPM_UNIT="${unit_file}" \
+    nfpm package --config "${nfpm_config}" --packager apk --target "${apk_file}"
+
+  sha256_file "${rpm_file}"
+  sha256_file "${deb_file}"
+  sha256_file "${apk_file}"
+}
+
+build_arch amd64 x86_64 amd64 x86_64
+build_arch arm64 aarch64 arm64 aarch64
+
+find "${packages_dir}" -maxdepth 1 -type f | sort