chore: add structure_test for custom registry example (#78)

e2e/custom_registry/WORKSPACE

@@ -1,3 +1,5 @@
+workspace(name = "custom_registry_example")
+
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 local_repository(

e2e/custom_registry/app/BUILD.bazel

@@ -1,6 +1,6 @@
 load("@aspect_bazel_lib//lib:transitions.bzl", "platform_transition_filegroup")
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
-load("@contrib_rules_oci//oci:defs.bzl", "oci_image", "oci_tarball")
+load("@contrib_rules_oci//oci:defs.bzl", "oci_image", "oci_tarball", "structure_test")
 load("@rules_pkg//:pkg.bzl", "pkg_tar")
 
 go_library(
@@ -55,3 +55,9 @@ oci_tarball(
     image = ":image",
     repotags = ["gcr.io/example:latest"],
 )
+
+structure_test(
+    name = "test",
+    config = ["test.yaml"],
+    image = ":image",
+)

e2e/custom_registry/app/test.yaml

@@ -0,0 +1,5 @@
+schemaVersion: 2.0.0
+commandTests:
+  - name: "test"
+    command: "/app"
+    expectedOutput: ['"Hello World"']