setup a simple nginx web server (#24)

Instead of configuring this template with a non-existing
container use a simple nginx web server just to deploy this
template into an initial working state.  This will allow
further development from a working state.

Author: zaro0508

app.py

@@ -42,7 +42,7 @@
 stack_name_prefix = f"app-{environment}"
 fully_qualified_domain_name = environment_variables["FQDN"]
 environment_tags = environment_variables["TAGS"]
-app_version = "edge"
+app_version = "latest"
 
 # Define stacks
 cdk_app = cdk.App()
@@ -79,7 +79,8 @@
     ecs_task_cpu=256,
     ecs_task_memory=512,
     container_name="my-app",
-    container_location=f"ghcr.io/sage-bionetworks/my-app:{app_version}",
+    # can also reference github with 'ghcr.io/sage-bionetworks/my-app:{app_version}'
+    container_location=f"nginx:{app_version}",
     container_port=80,
     container_env_vars={
         "APP_VERSION": f"{app_version}",
@@ -93,7 +94,6 @@
     props=app_props,
     load_balancer=load_balancer_stack.alb,
     certificate_arn=environment_variables["CERTIFICATE_ARN"],
-    health_check_path="/health",
 )
 app_stack.add_dependency(app_stack)