added ci scripts for rust

ci/run-cargo-test.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+ERROR=0
+
+while IFS= read -r -d '' f; do
+  dir="$(dirname "${f}")"
+
+  echo "run 'cargo test' in ${dir}"
+  cd "${dir}" && cargo test
+
+  if [[ $? -ne 0 ]]; then
+    ERROR=1
+  fi
+done < <(find . -type f -name 'Cargo.toml' -print0)
+
+exit ${ERROR}