Error while deploying Google App Engine(GAE) Flexible via Terraform script - app-engine-flexible

Question

I created a terraform script to deploy a Java app engine to GAE flexible as below:
resource "google_app_engine_flexible_app_version" "test-terraform" {
version_id = "v1"
project = "project-id"
service = "service-terraform"
runtime = "java"
liveness_check {
path = "/"
}
readiness_check {
path = "/"
}
env_variables = {
port = "8080"
}
deployment {
zip {
source_url = "https://storage.googleapis.com/[BUCKET_NAME]/[ZIP_OBJECT_NAME]"
}
cloud_build_options {
app_yaml_path = "[PATH_TO_APP-YAML_FILE]"
}
}
# resoucres config
resources {
cpu = 1
memory_gb = 2
disk_gb = 10
}
# scale config
delete_service_on_destroy = true
}
I tried to change the value of PATH_TO_APP-YAML_FILE to
location of app.yaml on Storage
localtion of app.yaml on ZIP source code as "./src/main/appengine/app.yaml"
but not success deploy, error detail on Cloud Build show as below:
Step #1: WARN - A yaml configuration file was expected, but none was found at the provided path: app.yaml. Proceeding with default configuration values.
Step #1: Exception in thread "main" com.google.cloud.runtimes.builder.exception.ArtifactNotFoundException: No deployable artifacts were found. Unable to proceed.
Step #1: at com.google.cloud.runtimes.builder.buildsteps.PrebuiltRuntimeImageBuildStep.getArtifact(PrebuiltRuntimeImageBuildStep.java:77)
Step #1: at com.google.cloud.runtimes.builder.buildsteps.RuntimeImageBuildStep.run(RuntimeImageBuildStep.java:50)
Step #1: at com.google.cloud.runtimes.builder.BuildPipelineConfigurator.generateDockerResources(BuildPipelineConfigurator.java:104)
Step #1: at com.google.cloud.runtimes.builder.Application.main(Application.java:147) Finished Step #1 ERROR Blockquote
Could you please help me to point out exactly the value PATH_TO_APP-YAML_FILE?
Thanks!

Answer 1

According to the Terraform documentation this value stands for:
app_yaml_path - (Required) Path to the yaml file used in deployment, used to determine runtime configuration details.
However it is not clear if it is compatible with the source code being located in a Cloud Storage bucket. As suggested in the Terraform community page I would advice to open an issue in the HashiCorp forum to get more specific insight on this parameter.