Roboleaf product configuration runner

The application rbcrun executes Starlark scripts that define Android product configurations.
See README.md for details.

Test: go test
Fixes: 180529448
Change-Id: I7d728b47d3f381b7052a0d7d51c9e698e5c2e316

tools/rbcrun/testdata/cli_and_env.star

@@ -0,0 +1,11 @@
+# Tests rblf_env access
+load("assert.star", "assert")
+
+
+def test():
+    assert.eq(rblf_env.TEST_ENVIRONMENT_FOO, "test_environment_foo")
+    assert.fails(lambda: rblf_env.FOO_BAR_BAZ, ".*struct has no .FOO_BAR_BAZ attribute$")
+    assert.eq(rblf_cli.CLI_FOO, "foo")
+
+
+test()