add release assets workflow

hack/ci/upload-release-assets.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -e
+
+retry() {
+  for i in $(seq 1 10); do
+    if "${@}"; then
+      return 0
+    else
+      sleep "${i}"
+    fi
+  done
+  "${@}"
+}
+
+TAG="${1}"
+shift
+
+cd target/assemble
+
+retry gh release upload "${TAG}" --clobber ./*