AWS Blue/Green CodeDeploy to ECS install lifecycle event timesout

[admin]

As the title suggests, the blue/green deployment for ecs never finishes because the <strong>install</strong> lifecycle event never finishes and timesout.

This is the picture showing that:
<a href="

https://imgur.com/KY9a5

" rel="nofollow noreferrer"><img src="

https://imgur.com/KY9a5

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The appspec file:

version: 0.0 
Resources: 
  - TargetService: 
      Type: AWS::ECS::Service 
      Properties: 
        TaskDefinition: <TASK_DEFINITION> 
        LoadBalancerInfo: 
          ContainerName: "WordpressContainer" 
          ContainerPort: 80

The taskdef file:

{ 
    "executionRoleArn": "arn:aws:iam::336636872471:role/WordpressPipelineExecutionRole", 
    "containerDefinitions": [ 
        { 
            "name": "WordpressContainer", 
            "image": "<IMAGE1_NAME>", 
            "essential": true, 
            "portMappings": [ 
                { 
                    "hostPort": 80, 
                    "protocol": "tcp", 
                    "containerPort": 80 
                } 
            ] 
        } 
    ], 
    "requiresCompatibilities": [ 
        "FARGATE" 
    ], 
    "networkMode": "awsvpc", 
    "cpu": "256", 
    "memory": "512", 
    "family": "wordpress" 
}

I am pushing a bare-bones wordpress docker image to ECR which triggers a pipeline but it stucks on <em>CodeDeploy</em>.

Any ideas what is happening?
How am I even supposed to debug that?

P.S. it timed-out in 60 minutes with the message:

<blockquote>
The deployment timed out while waiting for the replacement task set to
become healthy. This time out period is 60 minutes.
</blockquote>