Simplify packaging and improve scripts

Much better test now as well.

ci/steps/release-static.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+main() {
+  cd "$(dirname "$0")/../.."
+
+  yarn release:static
+  ./ci/build/test-static-release.sh
+  yarn package
+}
+
+main "$@"