Use a minimal golang http server for the GAE default service image (#49)

Author: aabmass

gae-service-container/Dockerfile

@@ -12,14 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# This Dockerfile is used to generate a docker image that runs an Apache Server.
-# The Apache server is used to run a dummy default service for the Google App Engine for opentelemetry-ops-e2e project. 
-# The server listens at port 8080 (since this is the port which GAE listens to).
+# This docker image should currently be built manually and pushed to a proper location in the
+# artifact repository Docker image name -
+# us-central1-docker.pkg.dev/${PROJECT_ID}/gae-service-containers/default-service:latest
 
-# This docker image should currently be built manually and pushed to a proper location in the artifact repository
-# Docker image name - us-central1-docker.pkg.dev/opentelemetry-ops-e2e/gae-service-containers/default-service:latest
-# TODO: Automate this process
-
-FROM python:3-alpine
+FROM golang:1.22 as build
 EXPOSE 8080
-ENTRYPOINT ["python", "-m", "http.server", "8080"]
+COPY main.go .
+RUN CGO_ENABLED=0 go build -o /main main.go
+
+FROM scratch
+COPY --from=build /main /main
+ENTRYPOINT ["/main"]

gae-service-container/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+)
+
+func main() {
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprint(w, "Hello world")
+	})
+
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}

tf/gae-standard/gae-standard.tf

@@ -85,7 +85,7 @@ variable "runtime" {
 }
 
 variable "entrypoint" {
-  type = string
+  type    = string
   default = ""
 }
 

tf/persistent/gae-default-service.tf

@@ -14,14 +14,15 @@
 
 # Create the deployment for the default service in Google App Engine
 resource "google_app_engine_flexible_app_version" "default" {
-  version_id = "v1"
-  project    = var.project_id
-  service    = "default"
-  runtime    = "custom"
+  version_id      = "v1"
+  project         = var.project_id
+  service         = "default"
+  runtime         = "custom"
+  service_account = "${var.project_id}@appspot.gserviceaccount.com"
 
   deployment {
     container {
-      image = "us-central1-docker.pkg.dev/${var.project_id}/gae-service-containers/default-service:latest"
+      image = "us-central1-docker.pkg.dev/${var.project_id}/gae-service-containers/default-service@sha256:70dccd7bdd8e0671fa40283be19fb5a4e4134d0cbaf1cb0d295081c05bdad34b"
     }
   }