Add empty test to get release flow to pass (#5)

Author: fmeum

tests/BUILD.bazel

@@ -0,0 +1,7 @@
+load("//shell:sh_test.bzl", "sh_test")
+
+# Placeholder test to get the release action's `bazel test` to pass.
+sh_test(
+    name = "test",
+    srcs = ["test.sh"],
+)

tests/test.sh

@@ -0,0 +1 @@
+#!/usr/bin/env bash