Add manual release script (#16799)

Unfortunately I need this sometimes

scripts/manual-github-release.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+#
+# Manually perform a GitHub release for a broken automated release that otherwise went out.
+#
+# PLEASE USE WITH CAUTION.
+#
+# It can take a while to download all the artifacts.
+#
+# Requires the `gh` CLI.
+
+set -euo pipefail
+
+if [ ! -n "$COMMIT" ]; then
+    echo "COMMIT is required."
+    exit 1
+fi
+
+if [ ! -n "$RUN_ID" ]; then
+    echo "RUN_ID is required."
+    exit 1
+fi
+
+# Create directory for artifacts
+mkdir -p "release_$RUN_ID"
+cd "release_$RUN_ID"
+
+REPO=$(gh repo view --json nameWithOwner | jq .nameWithOwner -r)
+
+# Download all artifacts for the workflow run
+gh run download "$RUN_ID" --repo "$REPO" --pattern 'artifacts-*'
+
+MANIFEST="artifacts-dist-manifest/dist-manifest.json"
+
+# Extract values from manifest
+TAG=$(jq -r '.announcement_tag // .tag' "$MANIFEST")
+TITLE=$(jq -r '.announcement_title' "$MANIFEST")
+BODY=$(jq -r '.announcement_github_body' "$MANIFEST")
+PRERELEASE=$(jq -r '.announcement_is_prerelease' "$MANIFEST")
+
+# Write body to temp file
+echo "$BODY" > /tmp/notes.txt
+
+# Merge artifacts-* directories into artifacts/ (like CI does)
+mkdir -p artifacts
+cp -r artifacts-*/* artifacts/
+
+# Remove the granular manifests (like CI does)
+rm -f artifacts/*-dist-manifest.json
+
+# Create release
+gh release create "$TAG" \
+    --target "$COMMIT" \
+    --title "$TITLE" \
+    --notes-file /tmp/notes.txt \
+    "$([ "$PRERELEASE" = "true" ] && echo "--prerelease")" \
+    artifacts/*