add release assets workflow

hack/assemble.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+set -e
+
+cd "$(dirname "${0}")/.." || exit 1
+
+. "hack/common.sh"
+
+mkdir -p "${ASSEMBLE_DIR}"
+
+build_arch() {
+  ARCHITECTURE="${1}"
+  TARGET_ARCH="${ARCHITECTURE}" ./hack/build.sh
+  cp "target/final/${ARCHITECTURE}/sprout.efi" "${ASSEMBLE_DIR}/sprout-${ARCHITECTURE}.efi"
+}
+
+build_arch x86_64
+build_arch aarch64