perf(repo): parallelise api tests and cache image builds in ghcr (#1984)

tools/ci/run.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+set -euo pipefail
+
+if [ -x "${FLUXER_CI_BIN:-}" ]; then
+	exec "$FLUXER_CI_BIN" "$@"
+fi
+
+script_dir="$(cd "$(dirname "$0")" && pwd)"
+exec cargo run --quiet --manifest-path "$script_dir/Cargo.toml" -- "$@"