Add release artifact sync workflow

.github/workflows/sync-release-artifacts.yml

@@ -0,0 +1,35 @@
+name: sync-release-artifacts
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Sync a single release tag. Leave empty to sync all missing releases."
+        required: false
+        type: string
+  schedule:
+    - cron: "17 2 * * *"
+
+permissions:
+  contents: write
+
+jobs:
+  sync-release-artifacts:
+    name: Sync release artifacts
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Setup arkade
+        uses: alexellis/arkade-get@master
+        with:
+          crane: latest
+
+      - name: Sync release artifacts
+        env:
+          SOURCE_IMAGE: ghcr.io/openfaasltd/inlets-pro-artifacts
+          TAG: ${{ inputs.tag }}
+          GH_TOKEN: ${{ github.token }}
+        run: ./hack/sync-release-artifacts.sh "${SOURCE_IMAGE}" "${GITHUB_REPOSITORY}" "${TAG}" >> "${GITHUB_STEP_SUMMARY}"

hack/sync-release-artifacts.sh

@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+usage() {
+  echo "Usage: $0 <source-oci-image> <target-repo> [tag]" >&2
+  echo "Example: $0 ghcr.io/openfaasltd/inlets-pro-artifacts inlets/inlets-pro 0.11.13" >&2
+}
+
+if [ "$#" -lt 2 ] || [ "$#" -gt 3 ]; then
+  usage
+  exit 1
+fi
+
+source_image="$1"
+target_repo="$2"
+tag="${3:-}"
+
+sync_release() {
+  local source_tag="$1"
+  local tmpdir
+
+  tmpdir="$(mktemp -d -t inlets-pro-artifacts-XXXXXXXX)"
+  trap 'rm -rf "${tmpdir}"' RETURN
+
+  crane export "${source_image}:${source_tag}" - | tar -x -C "${tmpdir}"
+
+  if ! gh release view "${source_tag}" --repo "${target_repo}" >/dev/null 2>&1; then
+    # Public releases are upload buckets for private builds, not code-based releases.
+    # If the tag is missing, gh creates it against the public default branch.
+    gh release create "${source_tag}" --repo "${target_repo}" --title "${source_tag}" --notes "" >/dev/null
+  fi
+
+  gh release upload "${source_tag}" "${tmpdir}"/* --repo "${target_repo}" --clobber >&2
+}
+
+if [ -n "${tag}" ]; then
+  source_tags="${tag}"
+else
+  source_tags="$(crane ls "${source_image}" | sort -V)"
+fi
+
+existing_releases="$(gh release list --repo "${target_repo}" --limit 1000 --json tagName --jq '.[].tagName')"
+
+synced=0
+skipped=0
+
+echo "### Release artifact sync"
+echo
+echo "| Tag | Result |"
+echo "| --- | --- |"
+
+for source_tag in ${source_tags}; do
+  if [ -z "${tag}" ] && echo "${existing_releases}" | grep -Fxq "${source_tag}"; then
+    skipped=$((skipped + 1))
+    continue
+  fi
+
+  sync_release "${source_tag}"
+
+  echo "| \`${source_tag}\` | Synced |"
+  synced=$((synced + 1))
+done
+
+echo
+echo "Synced: ${synced}"
+echo "Skipped: ${skipped}"