Add GCB config for uninstrumented quickstart (#405)

Adds a Configuration to allow building uninstrumented
version of quickstart sample on Google Cloud Build. The config file is
configured to read environment variables and push the built image to
Google Artifact Registry.

Author: psx95

examples/instrumentation-quickstart/cloudbuild-uninstrumented-app.yaml

@@ -0,0 +1,29 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Configuration to build the un-instrumented version of this quickstart on
+# Google Cloud Build. Also pushes the built image to Google Artifact Registry.
+# REGISTRY_LOCATION, PROJECT_ID, ARTIFACT_REGISTRY environment variables must be
+# substituted in this file.
+#
+# Using gCloud CLI:
+# gcloud builds submit --config <(envsubst < cloudbuild-uninstrumented-app.yaml) .
+steps:
+- name: 'gcr.io/cloud-builders/docker'
+  env:
+  - 'DOCKER_BUILDKIT=1'
+  args: [ 'build', '-t', '${REGISTRY_LOCATION}-docker.pkg.dev/${PROJECT_ID}/${ARTIFACT_REGISTRY}/java-quickstart:latest', '-f', 'uninstrumented.Dockerfile', '.' ]
+- name: 'gcr.io/cloud-builders/docker'
+  args: [ 'push', '${REGISTRY_LOCATION}-docker.pkg.dev/${PROJECT_ID}/${ARTIFACT_REGISTRY}/java-quickstart:latest' ]
+images: ['${REGISTRY_LOCATION}-docker.pkg.dev/${PROJECT_ID}/${ARTIFACT_REGISTRY}/java-quickstart:latest']